Dynamic Bookmark is not overwriting a selection.
An issue is that, when opening an application and a "default bookmark" is applied, the "Dynamic Bookmark" will not work.
Example
- Open attached qvf sample (dummy data). The default bookmark is applied.

- Apply "Max Value" bookmark = > expected selection is not made (selected string "three" remains).
- Clear the current selection value and apply "Max Value" bookmark (6 is selected as expected).
Resolution
Use =Only({1}dimText=vText) instead of =dimText=vText (see the attached qvf sample).
Internal Investigation ID(s):
QB-4049
Environment
Qlik Sense Enterprise on Windows