I think the CTA to star a board is reversed. Possible Bug? If you hover over the star of an already starred board, it says "Star this board".
The inverse is true for unstarred boards. Since "star" is the verb, the call to action would be incorrect, I believe.
Best answer by Robert Johnson
Update from Miro Support – the issue is resolved:
We're happy to let you know that the issue you reported has been successfully resolved. We entirely understand how important this feature is for you and your team, so we'd like to thank you again for your patience!
We're happy to let you know that the issue you reported has been successfully resolved. We entirely understand how important this feature is for you and your team, so we'd like to thank you again for your patience!