there is a 'snap' to grid or boundary setting, yours might be off? if pieces will connect if placed correctly. If something is placed off, you can open the dialog box and edit the x,y to what you need. But normally if you drop items they will place together right, maybe try zomming in more
The holes for the doorways in the premade maps don't line up with the snap-to grid. As an example, I was trying to place doors in the Inn interior map. It's a pain.
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