Boost leak, quick response please

I am in the middle of doing a boost leak test on my car and i can get the boost gauge to read 5 psi, then air will start coming out of the exhaust exit of my o2 housing. I am not sure why it is doing this and would appreciate some feedback. Thanks in advance.

You caught the valves in overlap, bump it a little bit to get the valves to close. Either that, or you have a bunch of bent valves.