The "+" is not unusual. It has been reported by
many people since FW version 1.2x was released over a year ago.
Here's one of the many examples:
What should the latest firmware be numbered?
Even though there have been many threads on the topic, I don't think it has ever been definitively explained
why the "+" shows sometimes rather than the actual FW version. Some people have seen it resolve after a reboot, some have seen it go away with an app update or reinstall, some after they've connected to the internet. Some have never seen it go away until the next FW update as far as I know.
Thank you Oso , I will leave it as it is .