It looks like there is a big update just starting to happen in the Google search results this morning.
It is super early but based on the initial chatter I am seeing within the SEO community, this one might be a very big one. It is so early that most of the tracking tools aren't even picking it up yet. But the chatter within the community looks to me that this might be a big Google search update.
Why big? Just based on the number of posts and what they are saying within a short time period. It can be some weird Google bug or it can be a new algorithm update that is causing a shift in the core rankings in Google.