It doesn't matter at all.
By waiving your right you are just saying that after you are admitted to a law school, you agree not to have access to the LOR in your file.
If your recommender lets you see it, it probably means the recommender thinks he's given you a good recommendation and you might like to see it. He has every right to give you a copy if he wants to do so.
Both my recommenders gave me copies. I didn't ask but I think they wanted me to know I had no reason to be concerned about a lukewarm letter.
Honestly, everything is fine. I bet you even got a glowing recommendation. Am I right?