Default [Q] Charging while off issue

Encountered some strange issue. When I charge while my phone is off, the normal battery ''charging'' animation appears for a couple of seconds, then it shows the Oppo logo following with the vibration (just like when you power the phone on) then it goes back to the battery animation. (it loops like this over and over) It also seems like the device charges very slowly this way too. Any suggestions to a solution and to why this is happening?

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