A/B testing differences between US and Australia behaviour

I am running couple of a/b tests on Australia and US, tests are exactly same but results they are showing are totally reverse. Since we tend to move successful A/B tests to be hardcoded on the sites this causes some issues.

Test is performing really well on US but has massive negative impact on Australia. I know that different areas have different online behaviour and preferences but I wouldn't think that discrepancy would be so big. I am kinda tempted to think that there might be an error in our Aus analytics.

Tests are exact duplicates.

Has anyone encountered similar results? If so what actions you took?