Why do I see so many different prices as guest?

Hello everybody,

I have checked the prices that the guest see while booking our apartment and I do not understand, what did I wrong - the guest sees two different prices for each amount of persons, under one policy. Have a look at the screenshot. I tried to search for 14th - 20th August, 2 pax. Huelin Park Apartment (Malaga).

Do you know what did I set up wrong?

I have activated one Last-minute promotion for these dates, but when I deactivate it, it remains the same.

Thanks for your help!

Martina