Cell value follows cell selected

[Jaguar2022]

User using Excel (Office 365) installed on a Windows PC.
Sometimes.... When the user selects a cell, a value will appear in that cell (Example: 24.98) and when another cell is selected, that value (24.98) will move to the new cell.
It doesn't matter where in the spreadsheet a cell is selected (with the click of a mouse) the value will follow (move) to the newly selected cell.
Close the spreadsheet & open it again and its OK... until it starts again.
Can anyone throw any light on where I can start looking to solve this please?

 

[Jimmypop]

Hi there

Is there and macros or VBA Code running?
Does this happen on all workbooks or only a specific one?
Any hidden sheets with formulas?

Maybe start checking these...