Hello @Emma94,
I searched for your listings for the dates 29 to 31 of March and found all of them once I searched while logged in.
All your listings have instant book set. Do you also require either "Government-issued ID" or "Recommendation from other hosts" ?
If you do, then searchers must be logged in while searching and must have whichever of those two things that you require. Otherwise your listing will not show up in their search.
They must be logged in while searching as otherwise Airbnb has no way to know if they satisfy those requested security requirements.
Hope this explains why you couldn't find your listings.
Steve.