Price issue when guest selects 28 nights

[Leandro-Albano0]

When guests try to select 28 nights on listing they get price dropped to less the 15% of the value for one night less.

I tested with dec-20 to jan-16 the price goes to 2000 BRL, now if I select one day less (dec-20 to jan-15), I get the full price 14600 BRL.

The is no discount set.

[Leandro-Albano0]

My listing

https://www.airbnb.com.br/rooms/53442243