Didn't notice it until I was done shooting. Fixed it shot some more and string stayed on. Am I gtg and how did it happen.

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Possibly you started out shooting with it off? 

Sometimes string nocks that aren't deep enough will start slipping the string as the string creeps and brace height and preload starts to fall. That happened to me and I liked the lower brace height so I filed the nock grooves deeper.

Got a picture of the nock grooves.

No I mean the string was was coming off the limb

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Draw length and bow length? Only thing I can think of..
Your not shooting a 52" recurve with a 36" draw are ye?

Could your limb tip be twisted?

Strings loop to big?