I've noticed recently that if I post a pin directly from my website to Pinterest, the pin titles aren't automatically populated like they used to be. (I've had Rich Pins enabled since I started my blog & account last year)
As soon as I noticed it, I started manually populating the titles.
However, I have no control over this when other people repost pins from my website to Pinterest. I have Social Warfare Pro so I should even be doubly protected from this, but somehow I'm not.
I would appreciate any help I can get with this please, as I feel like I'm leaving SEO juice on the table.
Here's an example of a rouge pin someone else posted from my site (so I can't edit it) with no title: https://www.pinterest.com/pin/63331938499465406/
Did you check to make sure rich pins is still working? Did you update your theme or site at all? sometimes you have to reclaim or revalidate rich pins when you do that 🙂