5x5 scramblers don't use triple wide turns. The centers need to remain stationary so that we can verify orientation mid-scramble, if need be. Also, it's just sorta awkward to do turns past half-way on a cube when you're reading a scramble.
So when you see 3U2 it means the 3rd slice parallel to the top is rotated twice as a single slice, and not a block turn.
Likewise 3F is a single slice turn.