I was fixing a few validation errors which involved swapping <p> tags with <br />'s.
While fixing the indents I noticed when I pressed the tab key, instead of getting one tab, it indented several tab widths to what it should be if I had set an autoindent setting. However, I pressed the tab key, not the enter key.
Under options was checked: "Auto Indent - Enter positions the cursor under the first non-whitespace char in the preceding line."
Unchecking this option fixed the tab issue. Is this by design? If so, maybe it should be reworded.