Try turning off the GPU acceleration of video processing for a little bit, (want to see if the issue is stemming from there).....Restart Vegas , then hit your render again and see if it's still messed up.

Turned it off, but the same problem remains. I think there's just something wrong with the program in general.
Some added history and context:

When I started the project it was at 1920x1080 resolution because that was the original video's resolution. However, the render would be 720x480, so somebody from Reddit told me to fix the project resolution.

IT DID fix one clip of the video where the keyframes are in place in the final render, but another clip is still off and the keyframes/animation are out of place. It was very frustrating so I finally decided to start the project over again. This time with the correct resolution from the start. I thought this would fix the issue but no, the problem remains there despite it being entirely new. I’m editing an original video so maybe I have to render that video first into the proper resolution, then edit that render and add the keyframes? But it shouldn’t be that complicated right?

At this point, I'm very desperate and would let any expert have a hands-on approach to this.

@TheFVguy

By far, the most common cause of the situation you describe is having different frame resolutions and/or asoect ratios selected in your Project Properties vs. your Render Template. The must match, or the positioning of tracks you see in the Preview is not guaranteed to be passed along to your Output file.

Unfortunately, you cannot correct this once you have started your project. You must create your New Project at exactly the resolution and Pixel Aspect as the Output numbers you have chosen.

Post your complete Source, Project, and Output details per this thread if you need more peer assistance with this project.

https://www.vegascreativesoftware.info/us/forum/faq-how-to-post-mediainfo-and-vegas-pro-file-properties--104561/

Welcome to the the discussions.

@TheFVguy

By far, the most common cause of the situation you describe is having different frame resolutions and/or asoect ratios selected in your Project Properties vs. your Render Template. The must match, or the positioning of tracks you see in the Preview is not guaranteed to be passed along to your Output file.

Unfortunately, you cannot correct this once you have started your project. You must create your New Project at exactly the resolution and Pixel Aspect as the Output numbers you have chosen.

Post your complete Source, Project, and Output details per this thread if you need more peer assistance with this project.

https://www.vegascreativesoftware.info/us/forum/faq-how-to-post-mediainfo-and-vegas-pro-file-properties--104561/

Welcome to the the discussions.

Yes, as I explained I did exactly that, a new project but the problem remains the same. Unless I did something different?

Media Info: (Only posted video since audio is fine)
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4
Format settings                          : CABAC / 3 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 3 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 17 min 50 s
Bit rate                                 : 784 kb/s
Width                                    : 1 920 pixels
Height                                   : 810 pixels
Display aspect ratio                     : 2.39:1
Frame rate mode                          : Constant
Frame rate                               : 24.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.021
Stream size                              : 100 MiB (85%)
Title                                    : ISO Media file produced by Google Inc.
Writing library                          : x264 core 155 r2901 7d0ff22
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
Codec configuration box                  : avcC

VEGAS file Properties:

Streams
  Video: 00:00:18.118, 29.970 fps progressive, 1280x720x32, MP4 v2 - AVC
  Audio: 00:00:18.133, 48,000 Hz, Stereo, AAC

ACID information
  ACID chunk: no
  Stretch chunk: no
  Stretch list: no
  Stretch info2: no
  Beat markers: no
  Detected beats: no

Other metadata
  Regions/markers: no
  Command markers: no

Media manager
  Media tags: no

Plug-In
  Name: mxcompoundplug.dll
  Folder: C:\Program Files\VEGAS\VEGAS Pro 21.0\FileIO Plug-Ins\mxcompoundplug
  Format: MAGIX AVC
  Version: Version 21.0 (Build 315)
  Company: MAGIX Computer Products Intl. Co.

OK. The frame rate might be the problem. The original is 24 frames while the rendering file was 29.9 or 30fps. I'll adjust the rendering template but knowing my history I'm not optimistic about this fix. I'll update it to see if it worked.

Your source media image size of 1920x810 is unusual.

Is your Project set to the same size and are you rendering to the same size?

Do you use Motion tracking?