I am trying to make a weapon shoot and animate but it won’t stick the arm when I am turning it to animate. I am following this tutorial: https://www.youtube.com/watch?v=YhwavY-FEEo
You might’ve messed up your easy weld or something is anchored. Not too experienced with Moon Animator but judging from watching a few minutes of the video, this might have been your problem.
Edit: Sorry, I didn’t watch the whole video but you could’ve also forgot to check the Animatable button in the bottom left when joining or joining in place.