lithium question

There fun,experimenting yesterday with solar charging on one of my LFP,I decided to only charge it to 90% with solar...The charts I have seen,show 13.4v as 90% so the solar takes it to 13.4v and cuts back to almost nothing and it still shows boost mode...The problem is even though my chart shows 13.4 as 90% my recently calibrated victron shunt shows 82.5% SOC..

So much for the charts huh...lol