How to reproduce:

• compile a program, make sure you have entries in the "build issues" window (I have used simple_gdbtest_app).
• put a breakpoint somewhere, debug the program on MacOS
• Now try to step into / step over.

Sometimes Qt Creator thinks F6 is the step-over short cut, and sometimes F6 cycles through the build issues (aka "Next Item").
This is in particular awesome when the build issues window is closed and you're wondering "Why the f*ck is that stupid thing jumping to that code location?!??".

I haven't found a way to reliably tell Qt Creator to do the one thing or the other.