This 100%
Always go by the voltage of the cells. They should be close to 4.2v each at full charge. Total battery 50.4v. They’ll never really reach 4.2 in my experience, after charging, good condition cells typically settle at around 4.18v
Your pictures show the majority of your cells at around 4.16, this is basically full.
I’d be concerned about cell 12 being a bit low. You can turn on the always on balancing feature to bring this in line with the other cell values and then switch back to charge only balancing.
The fact that cell 5 reads high with the charger attached is definitely concerning. I’d be closely monitoring the pack over the next few charge cycles to see what is up.
Edit: just noted that 12 only reads low when 5 is reading high… i agree with @A13XR3 that it’s likely a hardware issue. Ignore the bit about turning on always balance