Ninjago 2011 headwraps having no lego logo

I was recently going through my ninjago collection and noticed my cole dx, cole golden weapons, and kai dx all have matte hoods with a number instead of the logo. I immedetialy though they must be fake but then ive been doing some research and apparently some of the old hoods from that era and before didnt have a logo. The rest of the minifigure (head torso and legs all have the lego logo aswell) Just wanting to know if anyone has a same issue or know that this fact is true.