CIS injector leak

[Johner]

Hi,

I'm doing a few health checks on my CIS components to troubleshoot a rough /low dle during cold starts. I checked injector flow, all are evenly matched with good spray pattern and no visible leaks with air flow sensor plate lowered. I left the injectors in dry containers for an hour or so after turning off the fuel pump and found a few drops of fuel in them. Is this normal, or should the injectors seal.perfecly against residual pressure? I wonder if a gradual leak might be contributing to the starting issue

Thanks

John