Just a website bug. The website doesn't currently show the correct number of invited people to Lockerz but they do store the correct number in the database.
So don't worry, they know ou've had 3 accepted friends
Darn, site down atm. Havnt visited it for quite some time, i got my magic 80ptz back that i made - but it showed me that i have 20ptz only. I started to belive it and i was like "fook dat". Gonna start earning ptz again i guess.