AnimationEditor not making tweens properly

I tried making something with Roblox’s AnimationEditor, but the gun parts aren’t getting tweened properly

videos:

I tried looking through DevForum, and the only thing I did was change the SignalDeferred property in workspace to “default”. All the other properties weren’t affected

I also tried uninstalling and reinstalling Roblox Studio, and made new places, but it didn’t fix anything