I had a similar issue with a keycap set by KPRepublic too, one of their grey kits (the one that has many language versions), the keycaps stems are shorter resulting with the keycaps hitting the switch top housing, had to use washers I’ve 3D printed to prevent this interference on all rows except the top one.
Even using switches with protruding stems (U4T) didn’t fully prevent this and needed washers on R3.
Seems like it’s a hit or miss with Cherry profile keycaps that aren’t GMK, as if their keycap molds vary in dimensions or standards, I have another keycap set by another vendor named Yong qiu, which have their own issues but the dimensions seem up to the standard.
Upon searching I’ve seen this issue brought up with ePBT sets too, but I can’t say myself as I don’t own sets by them.