Mysterious 'Y' alphabet showing up on Multi-page app

[Frankie_H]

Dear all

I am trying to create an app with conditional page breaks. On my first page, I see an alphabet ‘Y’ at the top of my age.

While this is amusing, I have no idea why this alphabet appeared, and the Page Break column is empty. Is this a bug?

FYI, I am using Google Sheet to create the app.

Thanks in advance.

Best Regards
Frankie