To prevent potential injuries to someone sticking head or hand out of window, modern car window lifters incorporate check, to if they have some hardship rising window, on detecting of which they stop and go into this mode of not closing completely, and on twins it's also indicating with flashing window operating buttons.
Not that uncommon to see in winters if glass is frozen to seals (advise to use some rubber conditioner eg. gummipflege to reduce frosting to). Weird to see it happening not in winter.
If windows lifting mechanism didn't work after reset trick (btw, no need to wait that long as 15s, just with closed doors press and hold it 2-3s past it lowered, and then press to rise and hold 2-3s past it rised. If worked, should be observable right away, with buttons not flashing anymore, and windows operating normally), then i guess yes, something might be wrong and worth making a trip to dealership. (BTW, my memory is a bit vague on this, frozen glass to seals didn't yet happened for last years since started using said gummipflege, but it's also possible, that one needs to use the switches on door, whose window lifting controller needs to be reset)