Hi i had a small problem with my chicken loop last time that i was in the water. the matter is that when i was riding suddenly the loop came out of the harness bar. at the begging i thought that the safety leash open but when i look everything was ok, then i put it back again and when i start to ride after 2 min happened the same. Any advise? Thanks in advance.

Probably a problem with your hook.
If the sides of your hook are parallel when you twist the bar with it against the chicken loop .The bar twists the chicken loop off the hook. This is a big problem with the dakline hooks.
If it is this the solution is easy. Squeze the hook in a vice to make the bottom more bulbous than the sides . Have a look on the OR product page.