We first had to get the basics, before coming to specific problems.
When I look at your video, it seems that the titleblock you edit is not the titleblock you use in the project!
As I wrote in a previous message: You edit one titleblock but use and look at another in the project.
This is an educated guess, because in the project-tree the titleblock-template has a pink background color!
That means, that this titleblock (or element in collection-tree) is not used in the project.
If you use
Project --> Clean project --> OK
Does the titleblock with the pink background in the project-tree disappear?
Edit:
If you want to use a customized titleblock, save it to a new filename to company- or user-collection of titleblocks and adjust setting in QElectroTech- and project-settings.