Objects are moved to armature layer

When I create an armature using the bone tool, all of the objects (drawings imported from Illustrator) I draw the bones over seem to move to the armature layer. As a result, hiding the armature layer hides the objects/drawings that they're attached to.

This also prevents me from editing the different objects' layers individually, as they are all on the same layer.

This does not seem normal to me.

Thank you for your help.