7 Knot Evil Eye Bracelets: 2pcs Hand-Knit evil eye bracelets for protection

I bought these for myself and a friend. I chose the black and I love the way it looks! Unfortunately, both knots on the strings came undone within half a day and it’s now frayed. I showered before putting it on and noticed it while on a walk. I’m not sure what happened but I’m a bit disappointed. My friend’s bracelet is still in good condition!