Most new homes have a degree of dampness for awhile. Some builders will
even turn the furnace up high and let it run for days to dry it out
some. However, I would not expect to see noticeable damp block walls at
this point because those walls went up first and the outside should
have been waterproofed. The fact that it's only the one wall says
there's something going on there. If it's wet now, it probably will be
wetter later. If it's noticeable enough to take a picture and post
here, maybe someone could provide a more qualified view.