That has been my experienced with either bulk powders or known brands with pre-mixed capsules.
Is this a known side effect? Is to due too high T-levels? Adrenalin spike?
Androgens increase BP by increasing Adrenaline and CNS-Energy production.
Estrogens increase BP by increasing Water Retention.
But there are other factors in BP control; like inflammation/inflammatory factors, infections of the CNS, B-Vitamin and Magnesium status...Copper status (toxicity raises BP!), and also things like noradrenaline medications or cold medications...plus Stress levels being a big contributing factor.