Cura 0% flow half way

[MrApples]

Hi guys, I've tried diferent configurations and diferent models. As you can see in the picture, cura reduces the flow of the printer to 0% at the top half of the pieces, no matter if the pieces are 20mm or 80mm tall.I've tried to add supports, tried more layers, less layers, layer thickness, layer height... any clue??I've also tried to reset cura to defaults, but still.My printer is using a 1mm nozzle and pla+ filament.