Why did border-radius stop rounding on all sides?

Question

css

Hello, I had a big grief...
In general, I make a site on UIKit in my spare time, the last time I made up 3-4 days ago, and now I noticed such a thing that it stopped working. More specifically, here: He stopped rounding the bottom. But I don't remember doing anything like that to make it stop working. I understand that somewhere there is an overlap of all border-radius'ov, but in which direction to dig? PS I think if I throw off the CSS code with 15k lines, no one will dig, and I understand that this is not freelancing ... upd: This behavior is not only here, but also in the header, and in blocks, and in the modal window. How could it possibly be screwed up like that? border-radius: 10px;