Excel Showing a box as Seperator

Hi 

I have been having this issue for some time now. My excel worksheet shows a small box instead of a comma as a seperator. If i send the file to someone else, it shows comma as a separator but for not for me. Screenshot attached. What should i do? Reinstalling office didnt help (Or maybe i need to reinstall from scratch i.e. deleting everything office related from the laptop?)