yeah it is very common specially when you hit a capillary. if I inject closer to your belly button seems to decrease the chances of me hitting a capillary. Also, may be your needles is too big.
I only bruise in the abs area when I pull the syringe and blood come out too for insulin and peptide, I do my gh IM. But I have a friend who bruise everytime from a insulin needle and never from a regular syringe.