How many gates do you have? maybe that's the issue. The cost is for each individual gate. In the section "gates" you should get a disaggregated on how many gates you rent at each airport, the total cost of your rent, and the daily profit from your flights from that airport.
I knew it always goes some time further than the limit, but this is getting exhausting. I fought hard for the 1st spot, even arranging the deliveries on time to finish by 2021 at best, but I started losing ground in 2023. I don't know how longer I should remain on alert.