i had the same issues when switching brands. Even when both brands where tested and considered "very good generics" or even pharma.It's probably the hgh. I have it too since switching brands. Not quite as high as yours tho, when I feel like it's bad it's around 80 or 85 bpm which is around 15 bpm higher than normal for me. Gonna order me some nebivolol for it.
still not sure why this happens when all say "GH is GH". I am completely sure there is more to it and inter-individual differences to certain brands