[lisa]

Looks like a discontinuity in the UV map. There's a couple of ways you could fix it:

Option #1 : Make sure the top and bottom seam, you may need to inside-out the UV map to do this. (I'm not really sure how to describe the process very well, but you push the middle out and turn the edges in on themselves until the map seams.)

Option #2: Use an LSL script to change your mapping mode to cylindrical with llSetPrimitiveParams.