Powerbank works fast on every phone except for my Fairphone 5

Hi, I have a wonderful powerbank, charges very fast up to 5 times when I am away, except for my Fairphone 5, instead of charging it brings down the percentages left, after five minutes it went down with 3%. Tried other cables, cleaned the input, but still nothing, couple of weeks ago, during holiday it worked (thank god), ever since the holiday it did not anymore. Anyone had this problem before?

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