Common with every new bow as string settles [nice work for stretch]...which will happen up to 250 shots pending on brand or string...
You need a Press to do it proper...most of the bows I get that are string exploded happen at peep sight...so a press is advised when adjusting peep..
A press is necessary to twist string even 1 twist...
Unless you have a bow like APA...APA has an innovative Cam Lock allows the average archer to replace strings or cables, make adjustments, tune your peep, install accessories and tune their bow without the need of a standard bow press.
Its a good Idea to take other brand bows in to your local archery shop, as it may need a couple tweaks to end up perfect...its quick and inexpensive!!
Neil