Just curious ... do you happen to have any of these settings turned on?
And what is your success metric?
https://experienceleague.adobe.com/docs/target/using/activities/success-metrics/success-metrics.html?lang=en#what-will-happen-after-a-user-encounters-this-goal-metric%3F
Also, what sort of profile are you using for the user? Out of the box
TNTID or mbox3rdpartyid? Another thought would be to split your audience
in half via profile scripts and run an Experience Targeting activity
where group 1...