Victron 500A smart shunt not holding % charge reading, always returns to 100%

Hi, new member. I have a 500A smart shunt installed DIY. My % leisure battery charge remaining number does not hold. Connecting with the App next day (for example) I find my 93% has returned to 100%. There has been no charging, don’t have solar, engine not started, starter battery relay open (so starter battery leakage is not charging the leisure battery). With all systems off, the smartshunt App shows 0.0A in either direction. Everything else is OK, could I just have a settings error? I cannot rely on accumulated %, it should be stored in the shunt. Thank You.

Most likely you have some wrong settings, check this:

And the manual: