Okay, so it is closer now. That happens very likely because the keyword occurence for the first result is denser, as it has the keyword “vitamin” more times in the term fields, which has a very high weight now.
You can still probably balance this somehow with a bit of experimenting. Try bringing the terms weight and the titles weight closer together, something like this: https://i.imgur.com/zKyC0P0.png
It may take some experimenting, but try playing with the terms weight value only first. Eventually you should see changes in the order, and there might be a sweet spot, where the terms weight is just about right and flips the first two results to the desired location, without actually affecting the other ones too much.
I know it is super tricky to get it right, but for a human eye some items seem logically more relevant, but when a program calculates the actual relevance based on keyword occurences and density it may show something completely different.
