Battletag missing "#numbers" when switching region

When switching region from EU to Americas my IGN is missing the “#numbers” at the end.

Im an EU player. I play on EU servers most of the time and when i tried switching region to Americas my IGN was not the same.
The “#numbercode” was missing at the end of my name.
This makes me unable to play custom games with “save/load” options on Americas servers as the game does not recognize my IGN.