maysalward solved it by renaming the project. So the reason for this issue could have been e.g. some old references that didn’t get cleared, we couldn’t reproduce such an issue so we are also just guessing here.
You could try creating a new project, then copy all your code and assets to the new project folder and run the new project instead. Maybe also just removing the shadow build folder and then run a “clean” command followed by a “qmake” command (rightclick on the project folder in Qt Creator to access those commands) could help.