This is a flaw on Burton bindings, I had a pair that did the same thing. In addition to this i would get half way down a run and my toe cap would be laying in front of my boot cause the ratchets keep slipping under load.
Also my 9 yr old who weighs all of 60 lbs broke 2 Burton base plates in one season. It took 2 emails to Burton just to get a response. I was promised replacement parts.....which never arrived
We both have switched to Union and could not be happier.