Replying to Boot Question

So i went to a bootfitter a while ago and got some full tilt classics that fit well. But now there is a gap behind my calves when i put my forward pressure on my shins and when i lean back there is a gap infront of my shins. Im wondering if this means if the liners are packed out or if it wasnt a good fit in the beginning, i feel like this is starting to inhabit my skiing ability, and also i reason why im not able to butter well. Does this mean they dont fit well, or should i go back to a boot fitter and get their opinion?