Has anyone had all of their products delete out of their manual collections recently?

[Melissa_Colborn]

We have used manual collections on our website since launching it in 2018. Most of our collections are Smart collections, but there are quite a few manual due to seasonal products or specialty items that it's just faster to manually add them than set up the tags, etc to create a Smart collection. 

Recently all of my manual collections deleted the product out of them. I can't figure out why, but it has broken quite a few pages on my site and I've had clients think we no longer have the brand available. I can go back and redo it all, but ultimately it's frustrating and taking time I didn't alot for this month to manage the site. What could have been the cause? Could it have been the recent update?