I have just fitted around 80% of my new engineered wood floor. I have laid it on an underlay with a DPM on a concrete subfloor. The wood floor itself is hammered together tongue and groove and has an interlocking system. It is not glued. However I have just noticed that it has risen up in some places and creaks a bit. The rising up can be removed by applying weight to the area (i.e. me jumping up and down) but just appears to move to another spot. I have left lots of expansion space around the sides. My question is should I expect the creaking and \\\"rising up\\\" to dimish over time as the boards settle in or is it more likely that the subfloor has some small irregularities that are causing this? I was hoping the former was the case but fear the latter! Any thoughts?