The check ball should not come out of the coupler, the retainer at the top of the probe should keep it in. But if the retainer was missing the check ball may block beer from flowing up the line - agitating the beer and creating foam. But if you are missing the check ball - that would not cause foam.
Wild beer could be a result of poor seals with CO2 leaking out and air entering. Check out:
1. Bottom seal on your coupler. Is it there? Is it in good condition - no breaks or chips?
2. It is possible to have a "bad" keg. Sometimes the CO2 valve (black rubber seal) in the keg valve has been damaged during previous uses.
Wild beer could also be the result of:
1. Over pressurized beer - check the regulator
2. Beer temperature - should be 36° to 38°
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