[xhflhkeuhwguu34]

So, on my profile, you can clearly see I've refereed 4 members. However, when you (or I) go and click details, it only shows one. Why is this?

[Fox™]

If someone you refer changes their name, it doesn't update on the list of ref's. It also doesn't seem to show people after a certain amount of time, or just stops showing some people after time.

[Ombra]

Could be that the account was deleted, probably during the account prune. It is the same for other members, not just you. I wouldn't worry about.

Probably they have been pruned. I referred 3 users, 2 of these had their account pruned and disappeared from the list.

[D3xus]

The other accounts were deleted.

[Omniscient]

It's a broken MyBB feature.