I created a background called Wind Rider.  It is not public yet.  I was able to add the descriptive paragraphs in the first screen.  Then I added proficiencies, languages, and equipment to the next screen.  They are not showing up when I try to view the background.  I can click Save Changes but the screen does not change.  I can then find the new background in my collection, but the proficiencies, languages, and equipment are missing.  Editing does not seem to reveal the problem.  I created another background earlier, Bright Dwarf Apprentice, and did not have this problem.

Could you share here the link address of Wind Rider?

It is not submitted yet for public homebrew.  Once I submit it, I won't be able to edit it.  I suppose I could still make a new version though.

Moderators can take a look at it even if it is private, we just need the link address.

Here is the link:  https://www.dndbeyond.com/characters/backgrounds/30042-wind-rider

I just figured out that I can add the missing items in the descriptions section.  Now they show up, but I am concerned that characters will not be able to get the right proficiencies by adding the background.  Take a look at let me know if it now seems right.  I will do some experimentation of my own also.

Now that I added items to the description sections, the proficiencies, tools, languages, and equipment are showing in the description.  I guess the other items must have been entered correctly but not shown in the description.  The exception is the equipment which I can't seem to figure out.  I have equipment descriptions, but when I try to enter the actual choices, I keep getting stuck on entering the second field which is labelled choice description or something like that.  It keeps clearing itself and then saying it is required.  It would be great to have some instructions or something.

You need to enter the items singularly. One entry for each item.

I will keep trying, but I will publish this one for now.