Pressing TAB cursor moves a page to the right and not only 1 cell

Z

Zulu

I am used to using the TAB key to move the cursor only one cell to the right
(Shift+TAB one cell to the left), but for some reason the cursor is now
moving a page to the right (Shift+TAB page to the left). How do I change it
back so it moves only one cell?

Your help is much appreciated.

Deon
 
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