Brilliant!
I had exactly the same issue:
I referenced a URL in different places, with different stateParam values, but it was using the same stateParam value instead of the different values as I wanted. Changing "ui-sref" to "ng-click" fixed the issue.
(as gmarziou commented this is probably caused by Ionic's view caching)
This forum is really worth its weight in gold!
(well, it's weightless so that would still mean zero, but you get what I mean)