Excel Macro works but after a few weeks, I notice a few entries are not in order

I run a report off a Macro I created that copies data from one worksheet into a new worksheet. It works great for a few weeks but then after a while, we will notice a few of the rows show up out of date order.

One of the sorts is to order rows by date. MOST of the rows remains sorted by date order, but just 2 or 3 somehow show up out of date order.

I will correct by re-creating the Macro and we run into the same issue a few weeks/months later. Any ideas on what could be the problem? We are using Excel 2010.

Thank you for any ideas out there.