What is the difference between drinking these two drinks (detail in description)

Because I don’t want to confuse the title with too many numbers.

I drank an 8% Seagrams drink and a 4.5% Jack Daniels drink. That’s 12.5%.

Right now I am drinking a 14% Four Loko and I am feeling super freaking buzzed. Like way more buzzed than I felt the other two drinks, which I drank last night.

Why is that? I’m not chugging it and it takes me the same amount of time to drink both (4–5 hours).

Is 1.5% that big a difference? Or do I not understand alcohol % at all?

Thanks.