I've experienced same issue and located in Melbourne/Australia. I bought the ASIAIR mini last year and for months I could not polar align using Skywatcher HEQ5 pro mount. No matter how I adjust the Alt/Az knobs, clicking refresh, the numbers keeps increase/decrease doing loops. I would have spend like 30 mins each session and still couldn't polar align.
So after spending hours looking at youtube and forums, looks like i'm doing everything right, and got me thinking the issue was with the HEQ5 PRO mount. Lucky it wasn't because I chance upon this topic and have since downgraded the ASIAIR mini firmware/app version (android) to "1.9.1" and once I did that immediately I was able to polar aligned in 5 minutes now.
There's a new version v2.3 that was released recently but I won't be installing that, looks like the recent version 2.3, and 2.2.x have a lots of issues.
Now just to add a bit more, my mount/scope pointed to the South (southern hemisphere), but double story house blocks the southern sky so I slew somewhere to the eastern sky for polar alignment.