I have never been a fan or had luck with leaving a CONFIG button wired in. You only need it during SETUP anyway, so remove it from the loom.
Remove the MAIN power, reset the functions, and start over with your programming. Should only take 5 minutes. If that doesn’t resolve the issue, I’d suspect a damaged unit due to a prior charging problem? I had to send 2 units back last year for similar reasons where the owner MUST have swapped polarity while charging his bike.