Cubase sends SMTPE to early

I read the SMTPE data from what cubase sends out on port and compare that with the projects own timer cursor and the SMTPE display on a MCU. The project and MCU match perfect (MCU does not use real SMTPE) , but the SMTPE is often about 5 frames more than project after STOP. And it seems like that QFRAME is sent for all segments every time. The hole ideas with the QFRAME is NOT to send all, only the part that has been changed. It’s faster to send a full frame than send updates for all segments.