The loom in South Qeynos outside the Lions Mane Inn is actually a "Sewing Kit"
 

The consequences of this is that anything that requires a deluxe sewing kit or a loom to manufacture cannot be combined at thsi particular "Loom".

Normally this would not be an issue but the nearest loom is in Halas so I figured it was worth a bug report.

What were you trying to combine?

Various Cured Silk Items.

I have encountered the same problem.

I have tried the loom in Oggok and Freeport, and when I click on them they open as 'Sewing Kit'.

I am unable to do combines that require a loom.

looms
 

After discovering I couldn't make Studded Leather armor pieces in Freeport, I decided to port and try Kelethin, that loom is a sewing kit as well. I suppose I won't bother, it doesn't really matter anyway but it would have been nice to know that you can't make that set. I've yet to find a confirmed "Loom".