X, formerly known as Twitter, says it’s working to restore potentially millions of images and links that suddenly and rather mysteriously disappeared from the platform in recent days.

Axar.az reports that the issue was first spotted by X user Tom Coates, who worked out that images posted directly to the site between 2011 and 2014 were failing to show, while links using Twitter’s built-in URL shortener had also gone dead.

“Over the weekend we had a bug that prevented us from displaying images from before 2014,” the company said in a post on its Support account on Monday. “No images or data were lost. We fixed the bug, and the issue will be fully resolved in the coming days.”