Date inserts are connect to the calendar and we therefore require that they are chronological (from the top to bottom). We will automatically reset to fix the non-chronological ordering. This is due to how things are connected to the calendar on the home page as non-chronological ordering would break some parts of what we are displaying.
If you want to undo this, hit Command (Mac) or Control (PC) Z on your computer. You can also go into the Version History panel
We therefore recommend that notebook entries are structured from oldest work at the top to most recent at the bottom. If you need to create an entry where you require non chronological dates, we suggest you use headers instead.