How do I turn off random multiple cell selection in Excel?

[Cath]

When working in Excel, randomly when a single cell is selected, multiple
cells are highlighted. How does this happen, and how do I turn this off?

 

[Otto Moehrbach]

Hit the F8 key and see if that helps. HTH Otto

 

[Mar]

Cath
Did you find out how to turn this feature off? I am having the same
problems and it is very annoying. F8 key does not work!

 

[Kar]

I tried shift-F8 and it worked. Or maybe control-F8. But it did work.