Minecraft enchantment bows, only one spell one level is displayed?

As you can see on the screen shoot, strangely enough, I can only enchant on one level or only one spell is available.

I'm playing on a 1.16.4 vanilla server

FURTHERMORE: Everyone else on the server can enchant, except me not on these levels.

Hey look if you placed the bookshelves (must be 15 for level 30) like in the wiki https://minecraft-de.gamepedia.com/...aubertisch

they mustn't be too far away

Yes, they are correct and sufficient

It doesn't work because you have blocks between the bookshelves and the magic table.

The carpets.

There must be absolutely nothing in between, not even a torch. And no carpets either. There must be air blocks.

Remove the carpets (at least in place) and put blocks of wool in the floor instead.

Omg thank you, now it's finally possible.
Strangely, my teammates could still click on the others and be more enchanted.
- Many Thanks!

You're welcome.