Collision unreliable when character is stationary. Known bug?

Thanks for getting back to me. I’ve linked my project, I hope you can discover what I did wrong. I have moved on to other projects since then and I made some changes to Paper2DGame outside of what was in tutorial videos, but I never solved this issue so I’d love to know what was causing it for future reference! If you aren’t able to find any problems, could you please attach your own working project so that I can try and find whats different?

Here is project download link: https://.co.nz/#!iddHQYjY!j7qXCsKj0MOywxWkbnF38DWxVnN0e5dcE-LIOssIqB4