If you encounter this issue, please use "Retry shot" to reset the stones to their previous positions, and send us a screenshot of the top overview so we can reproduce the glitch and fix it. Thanks in advance.

Thanks for answering. I have replied back in email with a video precisely reflecting the bugs.

Plus, could you help me find out why my ratings maintain the same no matter I win or lose the match? Thank you!

Hi PPPPP
On November 24, you played KiknChickn. Your rating was 479, you won 7 points and your rating was 486. 
Your next games were on  November 26, you played quadtakeout and you lost 7 points.
So right now your rating is back at 479.

Nice to meet you.
I have played several matches during these days, and it is not shown in the match record. More than that, some players that have won against me found their ratings did not increase, they were pretty mad at me.
But surprisingly, before you replied back, I played another match and my ratings increase. I'm going to start a another match and check whether my ratings will change next time.