Modified Date(auto populated by system) get changed for all record without any modification in sheet

Hi Team,

In my smartsheet, Modified date which is an auto populated/system generated column, gets changed automatically for ALL the records even though we are not doing any changes in any of the records. This is causing issue in our workflow. We have defined modified date as the trigger point of our workflow. As a result, workflow is getting triggered for all the records many times. This is happening when we keep our smartsheet open in the browser.