Some lines produce what is called a "Gay" or "Rune" Tail, meaning they lay over the back of the Poodle. As the Poodle gets older some will relax and be somewhat straighter, it depends on how "Gay" the tail is to begin with.
My own viewpoint is that when we started docking the tails longer we started seeing more of this phenomenon.
The show ring hated the Gay Tail at first but now is being more forgiving, depending on the judge Both Stanzi and Touche' are donning Gay Tails. We think they are very cute and Poodley.