Adv Solar Panels and Adv Accumulators. This bug was in the original Rampant and is repeated in Rampant (fixed).

None of the Rampants change player objects. All changes are just a biters
If you insist on the opposite, then I need a save with a Rampant and no other mods, where the problem can be seen

The Adv Solar Panel/Accumulator are not changes from vanilla. They are additions. And this was not introduced by you...it was inherited from original Rampant so I am not sure if you are all that interested in fixing it. Umm...I am not sure how to explain it so I will describe how another modder showed me what was going on. He had me place an Adv Acc on the map, then put a belt strip on all four sides right up against it. Then do a CNTRL-C of all that, then carefully align that ghost over the top. Then hit R a few times. You'll see that something is weird about the "alignment". The modder said something about collision boxes but again, I am not a modder so I don't know all the right words.