I guess the big question is do the effect performance? If they still enhance your edges let it go. If you just can not stand looking at them? Well by all means replace them.
Bob at Oldawan sells replacement strops with double sided tape ready to go. Just a heads up? You can make them if you feel up to the job?
I have a couple roo’s and I just went ahead and charged them and started stopping. I heard in the grapevine a while back that Ken Schwwartz has a new formulation that conditions as well as charges the leather. Sorry that is all I know about that? But he is the person to talk to if your looking for 110%!
This link will get you started, Just Google him and there is all sorts of fun to be had!
http://www.chefknivestogo.com/kenscorner.html