I created a few homebrew classes of my own and enjoy it a lot. Two of my classes, a ranger and a druid, do not permit me to share it with the community, saying I do not have the required features for the right class levels. However, I do have all the proper levels and checked this multiple times. What could cause this flag/bug? How can I share my work?

You also cannot have any features at any other level either. If that is a nonissue, simply re-save the entire subclass.

But do yourself a favor and don’t publish right away. If you are still running into these problems then I guarantee that you will inevitably find some other mistake, or something spelled wrong, or a feature that could have been worded better, or a way to improve the functionality through the programming.... Once you publish you can no longer edit your homebrew without creating a new version and republishing it. That will leave ghosts of the old versions that will haunt your future homebrew endeavors forever. Give it at least a few months each to playtest them and edit them to knock out all the kinks before you publish. Pretty please, with sugar on top.