Have you updated the mount driver recently? I have verified that SGPro is waiting properly (and there are no other reports of this issue). This issue pops up from time to time with a variety of mechanical devices and, almost always, the issue is that the driver reported it was done moving prior to the movement actually being complete. In any case, we can help inspect the logs to determine the cause. You’ll need to grab logs from SGPro and also logs for the mount so we can see what they are saying to each other.
SGPro log guidance is here: How to Submit Logs in SGPro
For the mounts log, you’ll use the ASCOM Tracing Logs. For guidance using that, see the section titled ASCOM Trace Logs about half way down the page: My equipment is misbehaving...