Obviously some foreign matter has gotten into the moving parts. Usually this is a coin. Since it can jamb and burn-up suggest have "junk" removed before trying to use it again.
that is purely normal to have cleaning material in the fresh water tank as the vac picks up the dirt from the floor it should really go into the dirty pickup tank purely normal nothing to worry about
Hire a professional to steam clean your carpets... and never use a rental unit that uses liquid soaps or you will inject mold, mildew and and other contaminants from other peoples' homes.