Hello!
I get a small border edge around my tileable normal map about a couple of pixels wide.
(I’ve got UV map border set to 0 if that makes any difference.)
I attached an image where the map is offset by a few pixles so you can see the border clearer and a close up image.
Would love to get some help to understand why this happens, Thanks!
Well first it would really help to know how you’re creating the map and which version of ZBrush you’re using. 
allright :), version 4
and I’ve exported both with ‘Multi Map Exporter’ and inside the program, it gives the same result. There is also a line on my cavity and displacement map…
You need to scale your UVs down a touch so that they are within 0 - 1 but no value is actually 0 or 1.