Rectangle character

Square / rectangle character

I see ▯ instead of my emojis/ranks

Your pack probably is not synced with the configurations. Make sure to run /iazip after you added any new image and reupload the resourcepack if you are using Dropbox or similar hoting method.

More info on how to host the resourcepack correctly: resourcepack hosting

Make sure y_position is not greater than the image height in pixels and that y_position is not greater than image height * scale_ratio.

Minecraft doesn't support this, it won't work and there is no way for me to fix that, it's a limitation of the game itself.

Check your client and server logs to identify the cause of the issue if you still didn't fix.

Read here how to:

Resourcepack is not loading correctly