Dacron strings stretch a lot when they are new. They also wear pretty fast.
You need to twist that string up. It’s not unwinding so much as it is stretching and slipping. If you let it slip too much, you won’t be able to wind it up safely.
Unbrace the bow, take the loop off the bottom limb and start to twist it in the direction that will tighten the string. If you can’t tell by looking at it, pinch the string about an inch below the loop so it won’t move and then twist the loop. You can then feel/see the string get tighter in one direction. That’s the direction to twist
I’d put 40 twists on it to start with, based on how much it let down. If it’s too much, you can always untwist it again.
Check the brace height every 10 shots for the first several days. You will likely have to twist the string up several more times.
Have fun hunting!
