I'm doing simple trippy VFX inside VEGAS Pro, key out the sky using mask generator OFX & replaced it with an aerial shot of a beach.

So I make another duplication of the drone shot to cover up some unwated area that arent supposed to be mask out + cleaning up the key using pan/crop mask. But after I delete the mask generator OFX from that clip it will leave this half/glitched masking on my video. I already restart VP17 it still the same

Glitched Media (DJI Mavic Air Clip DJI_0808)

This clip is to clean up the key out sky using masking. It sit right below both composited child layer of the key out sky

Inside this clip contain Color Grading OFX & AAV Color Lab OFX

Same Media before removing Mask Generator OFX (DJI Mavic Air Clip DJI_0808)

This clip sit under multiplied layer to key out the sky, getting the alpha matting info from the child layer where

the media (Same DJI_0808 Clip) contain Mask Generator.

Inside this clip contain Color Grading OFX, AAV Color Lab OFX & Mask Generator