That's a known issue of new (with correct locations of Moon features) textures. The seams are also present in the sources for these textures (Clementine mosaics 2.0 [2008]). It's a lack of high resolution image data for those regions.
I'm sure the Moon textures will improve in the future after using LROC images for textures.
If you want the Moon without seams, but with incorrect location of surface features, you can use my Level 10 Moon (Clementine mosaics 1.0 [1999]).