Looks like you are using Target as the reporting source. So, the first things I'd check are (and it sounds like you've already checked - but just for others who may see this):
Confirm my metric settings in the activity. Are the mbox names exactly what I'm expecting? Have you added any audience refinements to the mboxes? Are the audience refinements exactly right?
Confirm the "goal" metric versus the "additional metrics". Will a visitor convert on the goal metric prior to the additional metrics? If so check the advanced settings on the goal metric don't "release user" this would prevent subsequent conversions from getting reported.
Double check your code that fires the conversion requests to Target. Check in the request to Target (via developer console or Adobe AEP Debugger) that the mbox names in those requests match exactly what you are expecting. Check any additional parameters (perhaps used in audience refinement rules) are exactly what you are expecting.
Check other environments in the reports. If your account has been setup with different host groups or environments you might not see QA reporting unless you switch the reporting environment. Report view > gear icon (right of date range dropdown) > environment > pick appropriate option.
If all this looks good but I'm still not seeing my reporting data. I'd try copying the Target activity and checking reporting in the duplicate of the activity. It's possible (though rare) that if you made several changes to an activity something could get corrupted in the activity. A copy/duplication of the activity will correct that.