I might see if mine has that too.
Last month when we had a bunch of warm rain and then it got colder I kept having condensation. I park my car inside the garage during the day, and work graves so it is outside at night. For multiple nights in a row I had an inside windshield that was dripping wet... tried running A/C and driving with windows down to get the moisture out but it kept coming back for several nights.
Hasn't done it in a month or so though.