Double faces on UV map? I added seams to a cylinder that had a solidify applied to it, the inside is fine and is all connected on the UV map as it should be with the seams  I added but on the outside the majority are messed up with a bunch of duplicates that I can't delete.

If I do remove doubles it doesn't remove any verts and if I move the face either on the 3d view or the map it moves the same face with the same verts and edges connected? I've never seen anything like this...
Smart UV Project works for me on 2.79. I added a primitive cylinder Edit/Face mode/deleted the cylinder top face. Back to Object mode/added "Solidify Modifier" (BTW hate that name), applied "Solidify Modifier". Back to edit/face mode, select all/apply Smart UV Project at default settings. Result is fine.

So are you saying that the faces/verts of the outside of the cylinder are locked to the inside faces/verts?