[[MM]RoXoR[FS]]

pawn Код:

number<1 || number > 2 || number > 3 || number > 4 || number > 5
number < 1 || number < 2 || number < 3 || number < 4 || number < 5

These lines makes no sense.
First line checks if number is less than 1 or if it is greater than 2
Second line checks if number is less than 5

Try using this instead

pawn Код:

if(number<1 || number >5) return SendClientMessage(playerid, COLOR_GREY, "Vehicle  1, 2, 3, 4, 5"); 
//Your other code.