LaTeX: Strange "La, Lb" showing in nested enumerate

I'm writing a big LaTeX document. In it I have a nested enumerate environment:

\begin{enumerate}
     \item Bla bla
     \item More Bla Bla
     \item Now we nest:
        \begin{enumerate}
        \item Nested Bla Bla
        \item ...And more
        \end{enumerate}
     \item Back from enumeration
\end{enumerate}

The problem: In the output the enumeration of the nested part is with "La", "Lb" etc.

As I said, it's a complex document a开发者_如何学Gond I'm sure the error is somewhere in the definitions/document class. So I don't expect a solution; rather, I hope that someone can pinpoint me as where to search, and what exactly to search (for example, what commands modify the numbering in enumerate environment in the first place?)

Your example above reproduces fine on my machine. Here's the output (as expected)

Now if you wanted to change the list numbering to look like (La), (Lb) etc, you'd add something like this to your preamble:

\renewcommand{\theenumii}{(L\alph{enumii})}
\renewcommand{\labelenumii}{\theenumii}

which will produce and output like

So you should look in your preamble/definitions to see if you've made any modifications like this.