What if you change it to ignore collision and always spawn*(on spawn actor node)*?
As for print string not working, it seems to be a bug with 4.14. Ever since 4.14 released I get this VERY frequently and I have to restart the editor entirely to fix it. It’s absolutely infuriating 
Edit:
I tried to download your project to take a look but there seem to be parts missing, the ThirdPersonBP folder is entirely empty. (nevermind seems Google Drive messed up, 2nd time download worked)