Dear Ismail, you right!
Problem was in PSK Sequence Decoder.
Two input ports has bitrate 5Gbit/s respectively, but output port had bitrate 1Gbit/s.
I dont khow how fix this mistake. PSK decoder has 4 parameters (2 parameters disabled). And we have only 2 main parameters in this block – bit per symbol (2 bits for QPSK) and Phase offset (45 deg).