Breakpoint in included header gives weird behaviour

Mac OS Sierra

I set a breakpoint in a header I'm including in "main.cpp" called "Terrain.h". I run the program and hit that breakpoint. If I click on the breakpoint in the editor to remove it, an additional breakpoint appears in the Breakpoints list that's apparently in the file "Terrain.h ." ( a space and period/full stop after the actual name)

Clicking the two breakpoints in the Breakpoints brings me between two "instances" of the same file.

breakpoint_test.zip

I've included a simple test case. Put a breakpoint in init() to reproduce.