Numbered list changes from number to letter

I am moving content from one document to another, when I brought the content into the "new" document (currently formatted 1.0, next level 1.1, next level 1.1.1, next level A), the second level (1.1) becomes a letter.  When I go to change the letter to a
number, the dialog box comes up to let me change it but when I say "OK" it doesn't make the change.
 
I thought I'd outfox it by advancing the list above (which is properly numbered) and just backing the text into it.  No such luck ...
the text backs up only to the left margin, and then changes back to a letter and
won't back up onto the previous line.  When I try to change the level format, it won't give me an option for, say, a 1.1 level.  That's listed as A and I can't get a 1.1.
 
Help!!  And thanks.

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