[FIXED] Sims washing hands in sink in different bathroom

This is happening to my Sims with some frequency. After using the toilet (autonomously) they will choose to walk away from a sink immediately adjacent to the toilet and instead use an identical model of sink in a room far away from their bathroom.  If they are directly tasked with using the toilet and then brushing their teeth, they will often walk to a different room to wash their hands and then return to the original bathroom sink to brush their teeth. Nonsensical on many levels.