Are the textures misaligned? If so, in the Face Edit Sheet select all of the displacement faces and click "treat as one" once that's checked off, just center the textures by clicking the C icon under "justify".
If the displacements themselves are not connecting, try using the sew feature in the Face Edit Sheet to sew them back together, if they can't be sewn, try realigning the displacements or re-building them in a way where they can be sewn together.