The way the softop works is that the water runs down the hood into a plastic gutter you cannot see. The water then either comes out each end of the gutter behind the seatbelts and into a drain hole and that water is expeled from just behind the rear wheel but you have to be under the car to see the exit pipe.
Therefore we need to know what year the car is to help you further but it could be a cracked rain rail or just needing the drain tubes cleaned with a trombone brush.
Please also advise where you are based as some member may live nearby and can assist if you are lucky.
Trombone Brush
https://www.ebay.co.uk/itm/Trombone-Cle ... SwDApaVj-bThese also work on a MK1 or MK2
https://www.ebay.co.uk/p/Dapetz-24-600m ... 0005.m1851