No, it does not mean that you had candida overgrowth. You can experience an imbalance of intestinal flora for many different reasons such as the flu, food poisioning or an overly aggressive cleanse. Candiditis is a more serious malady and takes 6 or more weeks to address.
I am happy to hear that by eating bulking foods and taking a pro-biotic that you were able to resolve your problem. I suggest you continue the pro-biotics for at least 1 more week to be sure that the flora balance is restored to your gut. You could also add pre-biotic foods that will aid your colon in manufacturing its own "good" bacteria and help to maintain the flora balance.
In my opinion it was most likely the combination and amount and not necessarily any one of the elements used. I always remember what a good friend of mine told me-"more is not always better".
I dont know that much about Oxypowder, but it seems to me if you increased your intake of foods that are rich magnesium and high in fiber you could cleanse more naturally.