This happened to me twice in a row. We placed two large sponges 1 block off from where they were supposed to be in our grid, so I broke the sponges. There's a lot of delay for the sponges to drop after the region is deleted on the server, and after that was done - when picking up the sponge it had turned into a regular sponge instead of the large protection sponge. I didn't record a video of this ( since I didn't realize right away what happened, and large sponges cost a lot ), but I attached the screenshot after hovering over the sponges that were picked up. Inventory was 4 large sponges, 18 small sponges, and after I had 2 large sponges, 2 regular sponges, and 18 small sponges. During the time, the person next to me was also breaking their large sponges, so it might be related to the lag. I can record a video to try to replicate if some large sponges could be supplied.