A couple thoughts...
First, I believe there are refresh property settings on tablixes, double check the settings on those.
Are you seeing this behavior in SSDT or when you deploy the report or both?
"I cant stress enough the importance of switching from a sequential files mindset to set-based thinking. After you make the switch, you can spend your time tuning and optimizing your queries instead of maintaining lengthy, poor-performing code."-- Itzik Ben-Gan 2001