Something strange happening when Applying Appearance to a Anchored Rig

I was programming a little inside Roblox Studio out of curiosity and discovered something strange when applying appearance to an anchored rig. Can someone help me?

image

What exactly is the thing that is strange?

this on image, the rig cant be normal

what does the original rig look like without any appearance?

A normal rig avaliable in the Roblox Studio, im talking about the Block Avatar