Maybe this isn't a bug or maybe it's been reported before. But basically, I had a custom title in a lower rank (I was some kind of green color). Now that I am orange, I wanted to use the same title for my new rank, but it won't let me since I already used that same custom title at a lower rank. Is there a way to use it again? Or am I stuck having to use another custom title? It seems to me that I should be able to spend RP to get the same title at a new rank.
This is not necessarily a bug but it's not exactly intended behavior either. That seems like a reasonable suggestion although I have also considered allowing you to "upgrade" a rank to a higher rank without having to spend the full amount (perhaps reduced by 25% RP).
Even if I don't implement the reduced cost feature to "upgrade" an existing rank to your new rank color, I absolutely agree that you should be able to spend RP to re-purchase the same title. I'll look into making this change in the very near future.