Mimosil Support Workshop: Mah Jong
When I set the game to US rules, why does it revert to Chinese rules ?
The current version of US rules adopted in Mimosil's Mah Jong happens to be the same as the Chinese rules. Therefore, if you try to switch your country rules from China to USA or vice versa, the game will not recognise the change.
You could continue to play with the rules set to China but, if you find that the rules do not match what you would expect, you may need to go into the other Options tabs and adjust the rules to suit your needs.