Need help in figuring out why characters are getting inserted when in Command-mode

I'm using MacVim on a new 15" MacBook Pro Retina with Mavericks 10.9.2.

When in Command-mode, certain actions can trigger the insertion of characters (e.g. "Ll", "Kk", "Jj", "Hh", etc. when cursoring around a document).

For example:

1.) Open a document with multiple lines
2.) Type ":set" <RETURN>
3.) Hit <RETURN> again to get back to the document
4.) Press 'j' key to cursor down 1 line
5.) Press 'j' key again to cursor down 1 more line
6.) MacVim treated both characters as a cursor down, but also inserts "Jj" on the original line where the cursor was when ":set" was entered (2 lines up)

This is very annoying since moving around a document randomly inserts these characters.

Does anyone have any idea what is going on?

Thanks,
--Dan

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