Why won't my phone fast charge while on, but only when its off?

My phone as of late has trouble charging when its on, even when its in ultra power saving mode, it took 4 hours to get to 90% charge from almost dead. While its off it has no problem charging, so I feel its some of the 3rd party apps that I've downloaded but I dont know how to tell what is drawing all the power or whats stopping it from charging properly while being on.

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