QT QTextBrowser text is unchangeable

i picked a simple QTextBrowser and filled it with some HTML text.. Now, my project is finished and I would like to change the HTML text but the input Text can't be changed anymore...

Fun fact: My text is no longer displayed, when running my project... Fun fact II: My "Highscore"-Button on my Mainpage isn't deletable too...

x There is no placeholder-text set x There are no textInteractionFlags x readOnly hook is set

Does anybody have an answer? Thank you guys.