just to be clear we were talking starter strip and like i said i don't use the vinyl,
Shane i see 3 or 4 things on that wall that would make that vinyl do that

nailed too tight was the least of that walls problems
take a corner post for instance,you know how you pin the top now that corner won't move why don't it buckle?s
cause its free to expand downwards,same thing when you lock nail xl panels the corner or panel or j don't have to move much in the slots to expand but at least 1 end needs to be unrestricted
and lets not go too overboard with the term ''tight''