Like everyone else said........it' s normal . Just take it to the shop and have them twist your cables. Get them to spend some time with you explaining what they' re doing and how it affects your bow' s timing. Take something and mark or scratch your cam above and below your limb(once it' s timed right) and then from now on you can look and see if it has changed any. Your string/cables will have minimal stretch from here on out and should last for a couple of years or about 20,000 + shots.Don' t worry about a new string for a while . But when it' s time to replace, the new Zebra' s are better , Winner' s Choice are very good, many others , and by the time you need one there will probably be even better ones out !! Also be aware of your cable bushings on your top limb, where your cable Y' s and connects to your limb. Those bushings will wear with time and cause you to lose some poundage, they are an easy fix though and cost less than $10 . Good Luck !!