Lines skipping when the iPad is charging

Whenever I draw while my iPad is plugged in, the lines are randomly skipping. Sometimes it happens when it’s not plugged in but I found out the tip sometimes unscrews itself after long drawing session.

I use an iPad Air 4 with Pencil 2nd Gen, with the latest procreate update. iOS 18 however, because I don’t want my iPad battery to drain out faster. A little nuance about the charger though : it’s not an Apple one. It’s an Anker with dual USB-C on the base (from what I know, Anker is certified by Apple so I hope it is safe for the battery).