How will this affect my uni offers

What do you mean? If you got AAB as your obtained actual A-Level grades, then that's all universities will see, and they'll either offer you an unconditional or decline a space.

Then what are the points in the UCAS predictions I thought they only saw UCAS predictions when they give you an offer and you only get new offers in clearing with your actual A levels?

February mocks: UUE
UCAS mocks: BCC
Actual A levels: AAB

I mean lets say I get BCC in my UCAS mocks, but an AAB in my real ones, what will unis see and what will they offer based on? I have to be doing my ucas applications soon and they wont see my actual A level results and will only see my UCAS prediction. So what happens if they just reject it based on the predictions but I pass every requirement in the actual requirement, apologies if I sound stupid but Im clueless right now

If you are getting your A Level grades this summer then you will apply to UCAS with your actual grades not your predicted grades.
If you are taking your A Level exams next summer (2021) then your college will submit to UCAS your predicted grades. These are what the universities will see and base your offers on. They won’t see past exam results. They will either offer you a conditional place which means that you will get into the uni if you achieve those grades on results day, or offer you an unconditional offer which means that whatever you achieve that will accept you regardless or decline you a place. If you wait until results day you can apply through clearing with your actual results where your near enough guaranteed to be offered places at unis with your grade entries as you have achieved the results. Ucas conditional offers are like a promise of a place but only if you achieve the grades that are required.

so I shouldnt apply for universities now, and I should wait for results day for my a levels?
Also, can a university reject a student based on ucas predictions? If yes, then is it possible to reapply when you get the actual a level results?

Of course they can. They can reject you for any reason they wish. If it looks like your not get going to reach your grades they might well reject. You can apply with your actual grades when you have them. At that stage predictions wont matter.

i guess i was worried for no reason then lol, thanks.

if my ucas mock is ACB or ACC, will a uni still offer if I am applying for AAA or AAB? Just a question on a whim

Nobody really knows the answer to this. If you apply with your predicted grades some will reject you whilst others might accept. ABC is quite close to the normal grades 2 grades down and 40% get in with 2 or more grades. If the course is oversubscribed it is likely you will get rejected.