Buildings that have already been built are now being "blown up". They don't seem to be chunk errors because they only destroy to their ground level. they don't go down to the bottom or edge of the chunk, only to the building. Two of the buildings that were destroyed were buildings I had built but the third one was one I built together with someone else. All the buildings that have been destroyed are also in the same area. This doesn't seem to be lighting because it had destroyed other blocks as well and I have not seen lightning do something like this.