Why ain't my note 9 charging wireless when it says it is.

Whenever i try to charge my note 9 on a wireless charger the promt shows up that it's charging and it also says in the top right corner. But after a while it has gone down in power. And the problem isn't that it isn't charging, when it's off it's charging all though slowly. I have tried the normal removal of case, restart phone.

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