Sunroof leak? Need expert opinion!

I test drove a Volvo XC70 yesterday. When I hit the brake hard I got few drops. There was no water dripping after then I found the sunroof cover was wet. The sunroof was dry and shut. It was a light rainy day and just had snow storm few days ago. Dealer said it might be the mositure inside car due to cleaning but he would check it later. I did testdrive another volvo xc70 and found the sunroof cover was wet too but not as wet as the other one. Is it normal or sunroof is leaking? Thanks!