G+ still has a lot of bugs. I usually leave it open. Every once in awhile, I look at it and posts will be missing. I will refresh the page, click Streams, or click the Google+ logo and *poof*! They're back. Today I checked in at a place for the first time using the mobile app. On the full-fledged website, this shows if I look at my profile, but it doesn't show on Streams. Which would be fine except other posts I make show up on Streams, so the behavior is inconsistent.