I've found that on a page multiple experiences were running with equal priority levels.
This should not be done, but I was just curious what exactly happens. Does one test show or maybe one of the tests randomly?
I can't find an answer in the docs, just that it could cause a collision.
Have a look at this page on priority:
Basically if they're on the same page with the same priority, the one that got activated last usually gets displayed (aka dropped last so it's the change that doesn't get modified)
From the documentation: