Battery meter slowly reducing under keyboard charger

[robocone]

This may have been caused by putting the phone to sleep. The actual battery charge level may get out of sync with the reported level. For example the battery may have been charged but is still reporting say 50%.

Then when the phone wakes up it tries to charge the already full battery. The phone gets hot and the charge begins to go down.

I suspect this because
 - this issue stopped happening after I stopped suspending the phone
 - putting the same battery into a pinephone results in weird battery charge level reporting for the first charge

EDIT: It is happening again without sleep

EDIT: It was caused by a broken pogo pin