The first photo definitely looks like it is getting ready to send up a bloom stalk.
When were they planted there? Where were they before you planted them?
How much shade do they get?
Any other information you can give us about their history may help. Do you know how old the rosettes are?
By the way, great photos.
Just a note, many of us last year ended up with new plants that were young offsets that ended up bolting. We are not sure why.
Some of the responded to twits method of beheading them, once you are sure they are going to form a bloom stalk. Almost all of them that I did that to last year ended up giving me a few offsets to carry one.
From last year.
S. 'Hookerii' went from this:
and finally to this:
to this:
This is what it looks like this year:
Every single tiny offset bloomed. : (
But beheading them all did force the plant to form more offsets some of which still bloomed, but it did leave some to carry on.