Masked area is smaller than area I've drawn?

[HotMountainMedia]

I'm trying to use mask paths to create a walk-by transition and have tried manually masking both the clip itself and the adjustment layer and both produce the same result.

I draw round the desired area for each frame, however when I go back to rewatch it, multiple frames are showing less of the content than I selected whilst drawing. Mask expansion is set to 0 for all frames.

Any ideas what I'm doing wrong?

Thanks

[paisleyz15123876]

Having the same exact problem!

[Ann Bens]

On which effect did you draw the mask?

[paisleyz15123876]

in my case i draw mask on a normal clip. no fx.