When you enter the same area twice (after you die) gain is duplicated
This is after i went in the map twice.
This is after i put items in inventory... you see items dupplicate

This happens when you leave the area with currency in your inventory and join the map again with the same currency in your inventory so it dupplicates the amount you have.
Thanks for the report, indeed seems like a bug. We'll look into this along with some other bugs related to gain some time after league-start when we get more time to do so.
I went into an Elder Crater map (t16) and got a zana map: Elder Ashen Woods (t16)

This is the total currency i picked up during gameplay:

This is what the client 'thinks' i gained during gameplay:

As you can see, some items are dupplicated, some not. Items that are dupplicated are the items i had before i entered Ashen Woods, and when i came back into crater they dupplicated.
My current settings are:

Thanks a lot for your detailed information, it will really assist us in debugging this!
We'll take a look at this as soon as we can (most likely some time during next week).
No problem! When I first saw your app, i was extremely enthusiastic about it. I'm happy I can help out.
Glad to hear, you're already helping a lot! 👍