I created a journey, added an Entry Source of type "Contact Data Entry Event". Data Extension I am trying to pull data from is linked to this Entry Event. Then I created an automation flow with a Fire Event activity and ran the automation. It worked well and data from the DE was pushed to the journey. I did it several times and everything worked fine.
Then I triggered (fired) the same event via REST API - https://www.exacttargetapis.com/interaction/v1/events and it worked just well.
BUT when I tried firing the event via automation studio again, nothing happened. I did everything as usual: cleaned the DE, uploaded data with overwrite option and launched the automation. I did it several times and still no luck.
Does anybody know why it is so?