So, everybody was right indicating the problem of States-TPPI implementation in Bruker: Bruker default sequences do not increment the receiver for the TPPI part of the States-TPPI.
The problem can be solved by adding
| nmrPipe -fn SIGN -alt \
when processing indirect dimension, or by shifting the spectrum 1/2 sw in the indirect dimension:
| nmrPipe -fn CS -rs (sw/2)ppm \