The DNN module ProImageGalery forces it's own CSS when installed on pages in DNN.
What happens is, the module has it's own header properties, which forces any text in the header to be italic, bold, etc and adds a 10px padding around the entire header, which causes the skin to be misaligned.
To fix this, bring down a fresh copy of the skin, open the skin css file and look for the #header property.
Once here. Put in these properties in the #header tag
This will correct the issue.