This is how a pass-up works. For example, your direct Referral donated R300 to you. When you step up or upgrade to Stage 2, the donation goes up to your Referrer's Referrer. When you step up to Stage 3, it goes to the 3rd Referrer, in that order all the way to Level 4 and that is how the donations from your generation’s referrals will flow up to you.
Those that you see in your 1st generation are your direct referrals, which you have personally referred, and they will donate R300 to you. Those that you see in your 2nd generation will donate R600 to you when they step up to Stage 2. Those in all other stages will donate to you whenever they step up and submit the donation required for that particular Stage. As your donations increase with every Stage upgrade, the same applies to your referrals donations when they donate to you in the exact same fashion.