Not sure if its a bug too, but unit tech level shouldn't affect it's size, getting it up to Uber Tech level makes units and buildings too large. Their hitbox stays the same, so you can kind of "mash" together small buildings or units into a small space where they clip into each other.
Another thing is Storage doesn't scale with tech level. It always increases your max storage by the default 500 no matter the storage's tech level (which is hugely wasteful when you have high tier power and metal gen).