Repeating instance in a flow report

Hi,
I'm tracking the steps (screen App) of navigation for an App.
I'm trying to see the navigation path by a flow report.
Often I don't able to see the first step of navigation even if it is tracked (by a freeform table I see home's screen is tracked).
If I check flow option "Include repeat instances" = Y, I see the first step of navigation in flow report, If I uncheck this option I'm not able to see the first step uncheck, it disappear from flow report.
Someone is able to explain me this behavior?

Thanks,

Alex