All of my photos moved to Recently Deleted folder.

About a half hour ago I opened up my photos app to see that in my recent photos there are 55 photos, rather than the thousands there typically is. I open the folder, and sure enough, all of my photos are gone except the ones from the past 24 hours. I checked on icloud.com because I thought it might be a sync issue, but they were not there. I checked my recently deleted folder, and they all were there, showing 29 days left until they were permanently gone.

They're now all being restored, but I'm a bit freaked out about this. All of the devices in my account list are my devices, and no one else has access to my account. I don't understand what could have happened, and it worries me that there may be a new security risk with iCloud.