All my other devices have updated to the latest version IOS, but I have one IPad that says everything is up to date, but it shows 9.3.5 instead of the latest 10 version.
Which model is it? The iPad 3 and older and the original iPad mini are not eligible for iOS 10.
Not sure, but it is from 2011.
I have the mini 2 with the same problem.
You can try putting your iPad into DFU mode and restoring from iTunes.
It turned out I was in the iOS 9 beta and had to remove that. So dumb.