Hey there,
its not really a bug but the small icon is glitched. It also happened in a earlier supernotes version.
Im currently on Ventura 13.5.2. I already re-installed it a few times.
All the other icons are working.
Hi @Kyumie, welcome to the Supernotes Community! 
We’ve not noticed this before and are looking into this. If anyone else is experiencing this issue please let us know!