Hello Marek,.. although you are using edges which are analytical, the mixing of a Loft feature (older feature with some limitations) around a rotated feature.. can be a double "edge" sword, as you have shown here.... so, in this case, Loft is not a good options.. and Boundary works better.
however,.. since I'm more of a surfacing person,.. so, I'd suggest you Delete the top surfaces and do a Boundary using the edges and Knit.. (image/file attached).. either way,.. Boundary works better than Loft in this case.
OSP-0201-04_forum z.zip 549.9 KB
tyvm for your advice, that was it - loft made around rotate feature. It wasnt a big issue (x-y axis difference of created elipse was 0,05mm) but I was curious why it happened. And because I am new to Solidworks and opposite to you absolutely NOT-surfacing person I didint even think about using surfaces in this case.
I made it using boundary / knit and it created three perfect circles, thanks again.