@T-Studio: I see on your screenshots, you are a Japanese astro-fellow! I started to learn Japanese a few weeks ago!
Regarding the Skywatcher Alt/Az driver:
- I am not the original author of that driver, but I made bigger changes/fixes this year.
- The Synscan driver is far more better now than the Skywatcher Alt/Az driver. If you have a Synscan handset and you can connect to your PC, I would recommend now to use that driver.
Known issues in the Skywatcher Alt/Az driver:
- The driver is currently sufficient for naked-eye observing, but not too much for astrophotography. You can manage maximum a few seconds of exposure with bigger lenses or with telescope.
- The tracking is more-or-less okay, but it does not calculate the coordinates absolute correctly.
- If you run your mount for many hours on different targets, the alignment subsystem can go crazy and a INDI/KStars restart is needed. _Never leave your telescope unattended in tracking mode or executing tasks in Scheduler for a longer period._
- I will fix some problems these weeks, but I don't have a time estimate when they will be fixed.
- I did not use Skywatcher Alt/Az driver a month ago, I don't know if the alignment subsystem went broken.
Honestly, I don't understand your problems completely, but here are some considerations for the syncing:
- The synced points are "forgotten" after you stop INDI server and the telescope. => You must sync 3-5 points every time after you start a new observation session to get an accurate model inside the alignment subsystem.
- Try to sync the _first 3-4 points_ between far points: move your mount in a new position 5-10 degrees away and do a new platesolving with syncing.