Data binding works in Modal but not on page WHY?

I’m trying to use a data binding with {{scShowAngebot.data.ShowProjektDetails.aspNachname}} from a data set. The value is displayed correctly in the modal, but not on the page.

Why, what am I doing wrong?

Many thanks for your help

Here is the value from the table.

sql1914×1080 563 KB

Here in the modal it works.

modal1923×1080 354 KB

But not here on this page

output1926×1080 258 KB