Why when i charge my tablet the battery decreases?

[Android Central Question]

Okay so a few minutes ago I was charging my tablet it was on 23% but now it's 21%? My tablet is a: Huawei MediaPad T3,I use a wall outlet,and I'm using my tablet's original charger help please

 

[belodion]

A bad charging lead or charging port?

 

[B. Diddy]

Welcome to Android Central! If you're actively using the tablet while charging, the battery level might still drop if your activity uses more battery than the rate at which it's charging.