I have just had a Hilo installed and have the exact same thing. It’s just where the stitching goes through as it needs such a big needle to do it. If it leaks then you could just spray some waterproofer over the area. The sort of stuff you can buy in Millets to re-proof tents etc.
I however have an even bigger problem in that I couldn’t get my roof to lock down properly last week when we were away, so it was going up and down like the proverbial fiddlers elbow. On one of those occasions, as the air was starting to turn blue and the red mist was descending I must have not been quite as thorough at tucking all of the fabric in, as the nearside got nicked in the scissor hinge and put two holes in it.
.
Now gonna have to get that fixed.
Out of interest who installed your roof
@Andrew Wilkinson? Also, do you struggle to pull yours back down? Does it freak a lot when driving? And finally is it steel or one of the brand new Aluminium versions?
Cheers.