Won't charge when above 90-100 sometimes

I bought 7t pro 2nd hand selling my 7pro..
I had my phone charged over than 100% in 7pro,
But now most of the times my 7t pro shows no adding mA while charging when my battery reaches to 90%..
So what i thought is either the seller sold me the duplicate charger? Or..
If 7t pro has any charging optimization to save battery health itself?

Please someone help me understand the real situation..if the charger is the fake one then m deciding to meet the seller once..
So first i decided first to be clear if its not a feature rather it's the fake charger..
Thanks in advance

And for added knowledge, 7t pro is charging with s10 15w charger while warp charger doesnt.
 
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