First, search the help docs and this forum. Maybe your question has been answered! The debugging steps can help, too. Still stuck? Delete this line and proceed.
Observe the image. Among other things, new nodes change color seemingly at random, the #Items group not showing up as an option in a note, and also for some reason showing and then showing #Items at random as an option of tags to select.
I forgot to mention the things i’ve tried. I’ve tried opening and closing obsidian and restarting my computer. I also tried dragging and dropping the group onto the node.