Clear Care Contact lens solution acting funny?

I use clear care for cleaning my contacts at night, and usually it works with no problems whatsoever. However, tonight, I put the lenses in the solution, and the solution immediately started foaming, until it started to overflow through the top of the bottle. I emptied it out and tried again, but it did the same thing. I was very careful to make sure it was filled to the correct line. Is there any reason why this would happen? Are my contacts still wearable?