Dear Garora,
Should not be the case. Is it the same every time you create a new test?
I definitely hope you would have deleted the test and re-created it, if not, can you do it and validate rather than deleting the experiences alone?
Target Delivery is based on the response and I don't think the response would be a certain Experience every time, if yes, there is some problem at the Target Decisioning Engine.
Thank You, Arun.