I am still new to journey builder and created a simple journey which I will break down.
Filters out Masterlist to 6months and 9months
In Journey builder 6months filter is used as the entry source with a random split of 50/50 percent.
I set the journey setting to Re-entry only after existing.
For my first journey run I had a contact of 6 which were all test records of mine. All tests runs went well.
Today I did a live test my data extension count showed 149 but when it did the random split it showed 155 entries instead. So I am guessing it added up the previous 6 counts.
What my question is the people who were entered before and stored in the entries will they be sent the email again even if my data extension is showing a different number example next week run the count will be 200. So only those 200 people will be sent the emails and not those already entered in the journey for the previous sends.