Word – Pressing tab to indent a list moves to the next table cell

One possibility is AutoCorrect settings were changed.

To fix this, click the Microsoft Office button, select Word Options. Under Proofing, click AutoCorrect Options.... Under AutoFormat As You Type tab (in the Automatically as you type section), make sure that the "Set left- and first-indent with tabs and backspaces" option is checked.

For 2007 it’s:

1. Office button → “Word Options” → “Proofing” → “AutoCorrect Options” → “AutoFormat As You Type”
2. Check the “Set left- and first-indent with tabs and backspaces” box.

For 2010 it’s essentially the same:

1. “File” menu → “Options” → “Proofing” → “AutoCorrect Options …” button → “AutoFormat As You Type” tab → “Automatically as you type” section
   • If you can’t find the “Proofing” panel as described above, try “File” menu → “Options” → “Mail” tab → “Editor Options” button → “Proofing” tab
2. Check the “Set left- and first-indent with tabs and backspaces” box.

For 2013 it’s:

1. Select the line you want to indent back.
2. There is a button in the “Home” tab titled “decrease indent” or “decrease list level”.
3. Left click this button.