Can't make a change on a page

Today I did the Openhab update from 4.0.4 to 4.1.1

Now I want to make a change to a page. When I try to save the change, it’s like my changes are being undone. They are all gone and the page is back to the status without my changes.
It’s just on one of my pages. All other sites do not show this behavior. What could be the problem? Other pages can be edited without any problem. There is no noticeable difference in the configuration of the page itself compared to any other page. I have this phenomenon on both Edge and Firefox.

Thanks in advance.

What kind of page? What kind of change?

Its a normal layout page

If I want to make a simple change on this site like to change the display name of a value.
Waschmaschine → Waschmaschine-change

After pressing “Save” or CRTL-S its like undo…

Could there be a write protection?

My mistake!! I found the mistake. A widget is integrated on this page. Therefore I need to change the widget and not the page. Sorry.