In Google sheets I have following formula "=(C1-A1) + (B1-D1)" to get the duration between two times, including a break. I have this in several cells and before I could mark these cells and get the correct sum in the right corner. But now when I mark more than two cells I get an incorrect sum. When I use the formula "sum" I also get the correct sum, but it is different from the sum in the right corner. I have the right format, which is duration so I can't figure out what the issue could be and what have changed since it worked before?