Hi Nsvrana,
I assumed that you are using PowerApps studio for Web. When I test this issue on Web player, I get the same result with you.
In a new screen, add a Gallery control, click the data source icon, the only option is “Add a data source”, though a data source has already been connected. After I add the data source again, it would be shown as 111_1.


Do you have PowerApps studio for Windows? It works well on desktop studio, if you have one, please try it on desktop studio.
Thanks for your feedback, I will collect and report this from my side.
Best regards,
Mabel Mao