An open crack in the window.

According to what you described, it is entirely due to the uneven settlement after increasing the load. If the cracks continue to develop and widen, they will form dangerous houses and become uninhabitable. The cement ground under the original foundation cannot be used as the foundation. Now the concrete floor has broken and sunk. Generally, the lower part of the cement floor has not been subjected to any stress treatment, so it will sink in the future. It is recommended that you often observe the cracks.