I don't find any of those suspicious, top 3 are one town teams, bottom 3 are big traditional sydney clubs. The numbers are about what I would expect. Pressing like is not much of a commitment.i did a bit of research of the NRL clubs & i'm pretty sure some clubs do buy several facebook likes
Brisbane: 527,800
Melbourne: 380,375
New Zealand: 359,732
South Sydney: 301,140
Paramatta: 256,471
Canterbury-Bankstown: 231,829.