Zero commissions are showing even though lead referrer has referrals for specified products

Is it the reports or is something not set up correctly in my commission program? Need tips please.

Referral partners has many reasons why this didn’t happen. So I’ll check my goto questions on this:

How long are leads tracked for against the partner
Do you have multiple commission programmes running concurrently
Is the referral partner a member of multiple programmes
Have you checked that the contact record is showing the referral partner (for trouble shooting)