Looking at the screenshot, it seems that the package is deployable but the loading sign is not refreshed. Usually if the package is still being built we won’t see the deploy option if I remember correctly.
You could reach out to mendix support to check as for other projects you’re able to build a new package.
I personally have not seen this issue, but hope this helps!
When I’ve had issues like this before it’s usually occurred when there has been a problem on the platform and has usually been resolved after a short while. It’s worth checking https://status.mendix.com when this occurs incase there is a known issue.