There's a problem in your screenshot, which shows the QuickEdit dots still present while the Pushback was being performed. This is not normal, those are supposed to be removed automatically when you press Enter to close the QuickEdit.
A possible reason for this, is you are running with too high AI settings, possibly using AI Injection ( but not only ), so the sim is too overwhelmed that it might have miss commands sent by GSX through Simconnect. When that happens, everything will likely malfunction so, you should try to fix that, for example by lowering AI settings, especially if you use AI injection.