Parents inviting too many random guests to a wedding they are not paying for
My FIL and I are paying for my fiancé and I's wedding, essentially splitting the expenses in half. We wanted to have a small wedding with less than 150 guests, with those guests being a collection of our friends in addition to family friends who have known us for a very long time. My parents wanted a big wedding and kept getting upset when we said we didn't want a big wedding. So, much to my fiancé's reluctance, we relented and upped our max guest count to 250 guests. Her father was nice enough to accept that he would continue to pay for half the wedding, despite now that all of their guests, my guests, and my fiancé's guests in total would be less than half the guests at our wedding. Now, my parents are saying that the guest list might reach up to 300 guests. I put my foot down and said if they want to have even more extra guests they would have to pay for each of those extra guests. They got very upset with me and thought that was an absurd request. They finally relented and said they would pay for those extra guests. But, now they are inviting completely random people that my family has had no relationship with, but my parents may have interacted with one member of each of these unnecessary parties a couple of times before.
My fiancé is shocked by this behavior and keeps telling me that it is insane how my parents are making these requests without paying for anything yet. They reluctantly agreed to pay for the flowers just recently, but that wasn't without several arguments saying that the girl's side should pay for ALL of the flowers. Mind you, her father is already paying for half the wedding for guests that he's mostly never met !
Now today they are saying that it is messed up for my fiancé and I to say that they haven't paid for anything yet because I have paid for half the wedding, and therefore it is like they paid. My dad said that our money and their money is the same. For context, I have been working a professional career job since I graduated college 6 years ago and have made my own money and paid for my own expenses, even before then. We do NOT share finances.
What am I to do here ? I am caught in the middle with my fiancé saying my parents are not contributing enough and controlling too much relative to their financial contribution, whereas my parents are saying they can do whatever they want and invite whoever they want.
We are one month away from our wedding. I just want our wedding to be really nice, especially since I spent so much money on it.