Hi PaQ - it's one of the various fillet problems in the geometry kernel - occasionally the end portions of fillets are not fit quite tightly enough to be totally smooth.
It probably happens in that particular case because the immediate area of the fillet at the closure point is not very curved, so the fillet surface is lighter there and didn't get enough points to make a good end shape.
There isn't a whole lot that I can do about it anytime soon - it's a difficult area of the geometry library to tinker with.
The proper way for something like that to be generated would be with a periodic closed surface generator, which the geometry kernel unfortunately is lacking. I made a custom one myself in order to do smooth closed lofts properly, but it's not so easy to retrofit that back into the kernel and also continue to take other updates.
- Michael
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