It could depend at what time(s) of the day they are getting the value of steem and steem dollars. 3rd parties sites may not always seek out the freshest information. The price of steem have been quite volitile in the last 3 days.
The value of steem they print at the top of their site, your first screen shot is cut too low to see it. I have no idea why it is missing on the second one.
https://steemit.com/steemnow/@penguinpablo/steemnow-com-two-minor-changes
images from @penguinpablo
that makes sense, thnx never seen there is steem value in $
Now that I review the post, there may be a good reason why you didn't see it there-and why it was missing from the second screenshot. It was a feature that may have been put in place in the last hour or so.