Sorry @Soufiane32 but you are
a) set up all wrong and
b) I am not even sure if Airbnb allows campsites.
a) People with more than 1 private room (camping space in your terms) need multiple listings so that when 1 room gets blocked another becomes available. I hope this makes sense.
b) Now I don't understand what you offer. Are the RVs/tents/caravans supplied by you or do people bring their own? If people bring their own then I don't know if this is allowed on Airbnb although there is a category called camping but 99% of the listings seem to supply the tents as well.
Anyway - In summary you need to correct your listings having been clear about what you are supplying.
Do come back with more questions once the basics are sorted out