Basen 26650 4500mAh Issue ?

Probably solved here: Charging rates and battery capacities - big difference? (#16 and #17)

Sorry, I did realize what you wrote (charge rate), but forgot to react on it.

I am not a specialist on cell chemistry, but I suspect that this could be causal for what you noticed.
Apart from that I agree with gauss163.

Watch the edit on #36 !

So there are only two types of Basen 26650 remaining.