It probably means that the stuff you have is at least dosed correctly. I was taking some dbol (diff. Source) about 2 years ago, that shot up my blood pressure so high, I started to get nose bleeds like every other day.I was on 40-50mg a day but it was definitely good shit. The only thing I can't make of, is the fact that you only taking 20mgs of tbol?!?! Maybe you should try throwing some coq10 and fish oil in your diet.
Edit: tren also raises your bp, so it might be because you are using both.
Hope this helps