This sounds similar to this issue here. Did you happen to see anybody get stuck attempting to move the beds like in that topic?
This is a known issue with items placed close to each other. Or, rather, it results from the collision boxes of these items. Although it looks like some items, including these tables, can fit immediately next to each other, they actually require a bit of space around them, so if you place them against each other one is moved up instead so it will fit.