This is a problem I have come across in several SW versions. The BOM table will sometimes not snap to the correct location. It will be perhaps 1/16 to 1/8 off of where it should go. Note that the BOM template is the same in drawings where it snaps properly into place, as in drawings where it misbehaves.

One working around I use is to deliberately offsetting it away from the drawing boarder, since that looks better than overlapping it. If I zoom in really close, I can sometimes get it to snap... but on a wide BOM, I can't seem to zoom in enough to both grab the icon to move it, and see the corner on the opposite side that I must snap to.

See attached image.

Joe Dunfee