From the following attachment you can find previous blocks and blocks are very different now,Cause layout we miscalculated the time which is the main reason,
You can see from the following annex the original block and the block is now very different, which is caused by the layout of the main reason we misjudged the time,
From the following attachments, you can find that the original block is very different from the current block,This is the main reason for our wrong estimate of the layout time,