In AOE2 TC’s can only be placed on flat terrains. There are also other buildings that cannot be placed on terrain that is too steep. While this is usually only a mild annoyance maybe preventing you from placing your Tc’s in an Ideal spot it would be cool if Tatars the hill specialist could circumvent this issue entirely
i always tought it was an hardcoded limitation of the engine? funnily enough, SOTL just posted a video on youtube in regard of TC placing and hills
I think the reason you can’t build TCs sloped ground is that their graphic is made up of several sprites, and the sprites can end up misaligned. I’m pretty sure there’s a way of forcing placement of one on a slope in the scenario editor, and that’s what happens (or at least used to happen in AoK, I haven’t tried it in DE).
SOTL tries it in his video, and what you described happens.