Water entry after two days of continuous rain in the wet cell!

Hello, I’m standing in front of a mystery! Yesterday my camper (Chausson Welcome4 – Fiat Ducato 2.8 – BJ 2002) had fetched from the workshop (TÜV – check). When I then opened the door to the wet cell – stood in the shower tray about 5 cm water!!!! I immediately examined the complete camper, otherwise only a touch of moisture had penetrated. The camper stood two days at the workshop outside and it had permanent rain and also a relatively strong wind. question at the workshop if he (is a good friend of mine) possibly opened the roof window – he denied this and said that maybe the strong wind raised the roof eye a little and then rained it in. Did immediately inspect the roof eye, if there is a defect (riss). But could not notice anything. I did not notice anything like this during my camping holidays. Did you perhaps have an explanation how this amount of water could enter? nt you give me a few tips or can it be that really with a very strong wind the roof eye (brand Fiamma) is raised slightly and then it rains in? With the two other roof eyes (other fabric) no water entry is detectable! For your help I would be very grateful – stand before a mystery!?