I'd check "show hidden characters" to get a better idea of what's going on there. Alternatively, you could just put tabs after the numbers and set all the text to line up to the tab.
Soounds to me like two didgits plus wahtever you have following them is wider than the first set tab, so it moves to the second tab to start the text.
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Ok, so after reading the current responses I was still confused. Then I revisited Adobe's help (http://help.adobe.com/en_US/indesign/cs/using/WSa285fff53dea4f8617383751001ea8cb3f-6da6a.h tml) and found this snippet of information that helped:
Note: The Left Indent, First Line Indent, and Tab Position settings in the Bullets And Numbering dialog box are paragraph attributes. For that reason, changing these settings in the Paragraph panel also changes bulleted and numbered list formats.
Tab Position: Activates the tab position to create space between the bullet or number and the start of the list item.
My numbered lists were messing up at 10 because I was only paying attention to the Left Indent and First Line Indent instead of also adjusting the Tab Position. To fix the issue, I went to Paragraph Style Options > Bullets and Numbering > Bullet or Number Position and set the following values:
Left Indent: 0.27 in
First Line Indent: -0.27 in
Tab Position: 0.27 in
Increasing the Tab Position moved over my text enough so that the extra digit in 10 would no longer throw in an extra tab.