brake master leaking..again

anyone else having leakage issues with BMC at the reservoir fittings…I have had this issue with a Dorman 1 1/8" and a Centric 15/16" new units…could it possibly be a vacuum booster push rod depth issue??? the reservoir is just a push in fit and what wear and tear could it possibly be subject to??? damn parts have dissolved the paint below the leaking area.