Ahh, I see, you mean there's a 1 pixel shift? What are the image size and grid sizes? There could be a 1/2 pixel math issue or some such? I assume you've tried other graphics and gotten the same? If you want to post a test campaign, I'll test it out. It's always better to be working with the same graphics/settings for these cases (lesson learned testing VBL macro's with Wolph!).
I generally overlap my VBL anyway just to make sure (as you can't tell as the door vbl is going to overlay it). In other words I draw my VBL over the hallways, then place doors with VBL, then go back and erase the hallways, leaving "door jambs" aka "door jamz"
But ya, if it is truly off by 1 (and not a 53 pixel door resized to 50 pixel grid, .5 pixel rounding thing) I'll fix it.