Part of a Rig teleports to a location when I budge it in Animation Editor

[Wolf_Games098 (YourOhioSkibidiSigma)]

So I have this Rig that I’m trying to animate, but when I rotate the Handle, the Arm suddenly goes to a position I do not intend to put it in.

It’s bugging me out for the entire day. Anyway, here’s the screenshot of the Rig