Excel screen doesn't update correctly

[Tanya]

Hi
Something strange is happening, when I go from one cell to another the
screen appears to update, but gets mixed up. The only way I have found to
fix it is to do a print preview or select another tab but now it is at the
point it happens every time I put data into a cell. This is very
frustrating, does anyone have any idea why this is happening?
Thanks in advance
Tanya

 

[Eduardo]

Hi,
check if you have your calculation method as manual, change it to automatic

 

[Jim Thomlinson]

Define mixed up... that could mean a lot of things.