Several problems with your file.
Firstly, it's the full project - over 35MB - so is unlikely to be investigated. The guidelines state it should be a minimal .capx with steps to highlight the problem.
Next it is using C2 release 178 which is very old - released on 19th Aug, 2014. All reports should be using the latest build, currently r216.
Rebuild with the latest C2 and test again to see if issue is still hapening. Many bugs have been fixed since r178.