"Save" on settings page warns about "leave page?"

[rolfkleef]

If I am on the settings page for my organisation, and change something, and then press the "Save" button at the bottom, I get a pop-up warning "This page is asking you to confirm that you want to leave - data you have entered may not be saved." -- This warning should not be shown when pressing "Save".

https://aidstream.org/wep/settings