TRIM_ARSPD_CM does not work in Loiter mode. Help!

Today I flew my glider in FBWA mode. Then I switched to Loiter mode. I had set the TRIM_ARSPD_CM to 1000 but the glider increased its speed up well over 30 m/sec. Here is the log data.

I can not understand why it happened. Please help me.

Please post a log file. The screen shot only provides a small part of the information needed and without a log file any answer is going to be a guess at best.

Thank you Allister,
This is the log file.
https://drive.google.com/file/d/1SqFuMaaHRNaYaboCwNgDru2gKapuOl1N/view?usp=sharing
I am looking forward your help.

Norm