4028 Part cooling Fan is not controlled correctly

Hey guys,

I tried my best to figure out what´s the problem but this is the first real self builded printer for me and I don´t get it.
I´ve connected the part cooler like the manuel did tell me. +/- on the permanent fan header on the BTT Octopus 1.1 and the blue wire on the - of the other fan port on the board. But actually my fan spins 100% when I set it to 0% in the Dashboard and 0% fan when 100% on the Dash.
How can i fix this inverted reaction.
Thanks a lot.