Bug(?) UOPI Suv (sort of SWAT)

Hello,I have a question.I've build 7 small police stations (on Operatore 112,Italian Versione of Missionchief) but it keeps spawning missions like(medium violent protest) that asks for 2 UOPI Suv and at least on UOPI VAN when this type mission should appears only when I have 8 police stations.I've also counted 7 stations ,manually and by the Dispatch Center.It's a sort of bug,I've I did something wrong? If do you have any Idea,please reply