Hard to say......
Hard to say without pictures to see just how much gap you're talking about. If it's real slight, the person who installed it may not have pressed the linen enough. Repressing the linen may close the gap. If it's a bigger gap, you may be able to move a few of the adjacent threads before repressing. If it's too big a gap, you may just have to have it rewrapped.
I'd suggest taking it to a good repairman and let him look at it.