Friends, who has encountered this? I've been working on bbcode for the last 10 hours and everything was fine... I took a break to drink some tea and see that all the images I uploaded today are now displayed incorrectly (more than 120 images).
Imgbb hosting used
Imgbb has autodelete-drop-down menu on their upload page which sets the time frame to hold downloaded image. Is there a chance that you blindly set it for too low value and downloaded your images? If not then it was probably a bug from their part.
As other suggested, to be on the safe side, use talkimg instead of imgbb.