Trouble with unwanted offset

[Picklepaws]

Hi there!

I'm trying to convert an image in a few steps.
It starts off as a 580x480 image and I only need 474x474 of those pixels.
So it goes from the original image, then it gets converted with a 474x474 circular mask (so now only the pixels inside of the circle are visible).
After that, I remove some colours from the image.

I'm certain the step that causes the offsetting is the mask.

Here's my steps:

convert ORIGINAL.gif \
MASK.png \
-alpha Off \
-compose CopyOpacity \
-composite \
-trim \
OUT.png

Does anyone have any suggestions to achieve the same result without offsets? (I'm getting a 3, 3 offset.)

[Picklepaws]

Nevermind! I just added a +repage and that seems to have fixed it.