Character acts weird

I had this character that i wanted to use, but when i open the studio animation editor it glitches .
not every time you move something but only when you move specific parts.

i deleted the character because maybe i made wrong joints, so i remade the character but without color or detail since i wanted to use it as a test. it’s essentially just a 2,2,2 cube with arms and legs.

test character joints:
Schermopname (195)

now… whenever i open the animation editor and rotate or move the arms it works fine.


but when i move the left leg i don’t even know how to describe it just look:

and right leg dislocates the head from the legs:

when i then leave the animation editor to delete the saves and start again my character has permanently been changed:

with the center of the model not even being in the center.

the only reason i haven’t posted this in studio bugs is because i wasn’t sure if it was really a bug or more a “you placed the joints wrong problem”, as a beginner in character-making… yes… i don’t know the difference , that is why i’m asking you!

thanks in advance! (please)