Welcome to The Forum!!

What a coincidence, I was telling my wife about safety cover anchors on our ride home from work today and this very issue.

I've never bothered epoxying them back in when they've come out of the deck Gravity keeps them in place during the summer and the tension from the cover and the fact that it's a tight fit in the hole, keeps them from coming out through the winter.

I'm not saying that epoxying them in is a bad idea, I just don't feel it's necessary (unless you have 3+ adjacent anchors that aren't secured in the deck).