I added a new campground on about Sunday, June 14 (Gateway RV Park, Sedro-Woolley, WA) It appeared on the website that same week about on Wednesday. It does not appear on either mobile app (iphone nor Android) as of yet (June 26)
I have verified what you report and I have forwarded it to the development team. I think that the issue probably results from the fact that the park doesn't have any approved reviews. I don't see that you've submitted a review of the park. Didn't you submit a review when you added the CG?
The park is a newly built local RV park that recently opened for business. Being close to where I live I did not stay there nor write a report for it. I spoke with the Camp Host, got the pertinent information, took photographs and informed him as to how the owner can "claim" the site.
FYI- New updates appeared for mobile devices yesterday and now the campground appears on them.(Iphone and Android)