I noticed in Foundry that the pixel size for the cathedral map to be 80x80 didn't line up properly across most of the map, however 70x70 does line up with most walls, aside from a couple around the inn and garage in the top left, top and bottom walls were in the middle of tiles instead of the edges of them. The pixel size for 80x80 I put in was 140, changing it to 160 got it to line up across most of the map.
Thought I should let you know.