Some events are not triggered in a consistent manner

[Scherady]

In my App developed in Android Studio I am using EasyFlow but the events are not triggered in a reproducible manner:

• some events are always firing in a perfect manner,
• other events are not firing in the first attempt(s) then they fire fine and
• others are never firing; proper breakpoints show that the "onEvent.trigger(context)" is reached by the state is not changing as defined in the flow.

All are in the main thread; here are extracts of my code:

onSelectingMainMenu.to(MAIN_MENU).transit(
onReturnToPreviousChoice.to(READY),
onSelectingMainMenuFinished.to(READY),
onSelectingSettingsMenu.to(SETTINGS_MENU).transit(
onReturnToPreviousChoice.to(MAIN_MENU)
)
)

...

switch (direction) {
case TOP:
onReturnToPreviousChoice.trigger(flowContext);
...

Any help?
Thank you.