Battery jumps to 100% instantly

DIY
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hello everyone. yesterday i left something on and the battery drained down to 20% so when i saw it i turned the drain off but it was a sunny day so the mppt was charging and it got to 22% something like that then a couple mins later the battery said 100% but the voltage was 13.15v and it didnt go up any more. so the next day i tried to test it again i drained it some more below 13v and then left it for the mppt to charge it abit and it jump to 100% again but max voltage it got to was below 13v. i cannot connect via connect app but can see it on the vrm just wondering if i can fix it without being there i saw online its the settings that got to be rejigged. i got a 100ah lifepo4 battery

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