Why do my friends hav different entry requirements for the same course?

Hi! So im applying international relations at Edinburgh, and I do the IB diploma. I however am so confused as to how all my international applying friends ahve different entry requirements. We all come from a privellged background, infact they are significantly richer than me. They don't seem eligible for contextual offers but somehow they've all been offered places for 34 points, whereas as a british student living abroad we all nhave been given an offer for 39 points? I find this really unfair considering they are in the exact same position as me? How does the university get away with this when its clearly because they pay 30k whereeas I pay 9k, as I can't find anything saying that they give lower req. for international students. On the webiste it says they only give lower entry requirements for this with compromised education, severe trauma ect....????!! It just sucks because the difference between 39 on the Ib and 34 is massive.