According to a report in the Daily Mail, Facebook users in the U.S. and U.K. have reported seeing old posts mysteriously reappear on their profiles this week like the content is brand new.

Some users initially blamed a hack, but the weird glitch apparently began occurring after Facebook’s latest iOS app update, leading many to believe it’s a technical bug related to the download.

One Facebook user told the Daily Mail that a post he’d originally published in September of last year was posted again on his page, looking like new content, and then it happened again with another post from this summer.

“I have since changed the posting dates for both, since I was starting to get comments and likes on them and didn’t want to confuse people with old news,” he said. “Otherwise, my feed and my stream look normal… at least the old news problem may distract us from fake news for a day or so.”

At the time of this writing, Facebook has not yet commented on what’s causing the bug. But in the meantime, it’s a good idea to check your profile and make sure there aren’t any old (or unwanted) posts sitting at the top of your Timeline.