This trend will continue if you keep flatting the hands that have his range crushed but 3-bet connectors. Overall you have to expect to loose money from the bb. Managing to loose less than 100bb/100 should be the goal.
At 50NL I'm loosing -45bb/100 from the bb so far. At lower stakes it was less. I think it's because of the higher ptbb/100 overall.
3-betting all pp's and some sc's against a steal raise by someone with 35% ATS is nothing short of suicidal.