If you have an item selected in build mode it will automatically build if its highlighted green. If you have enough resources it will build multiple instances on top of each other in the same place. It has placed 3 tents in one place inside of the crafting table without me hitting a button.
After testing on the suggestion of someone below i tried switching my mouse, and the bug no longer occurs. i am not sure what is happening and causing the issue as i have never had this in any other game.
Playing Solo/Offline on PC. No Mods.
Mouse: G502 Hero