Not at all. It's normal for PC unlike for cell phone.

It will shorten your battery life, so try to unplug your battery and use it directly or unplug the charger when you battery is full,

It's perfectly fine to use your laptop while charging, the laptop automatically switchs to the chargers power and your battery will remain 100%. Google it if you want

Eyebelah sra endemesrat malet new eko

i don't know why but it will effect your battery life. Try to use it directly.