I've noticed that on the main feed that sometimes when the post at the top has an image or animated gif, when it's bumped down by a new one that also has an image or animated gif, the first post's image or gif is sometimes displayed instead for a short time.

The issue is that I just had a NSFW animated gif post at the top of the feed (blurred out) that got bumped down by a SFW animated gif post but temporarily that second post had the unblurred NSFW animated gif from the post below it in place of it's own.