Hi,
Sounds like dropdown box 4 and 6 don't have the items values set up correctly. If you assign a value to the dropdown that is not in the list it will just display that value.
I'm not sure I understand the second part of your question, as isn't that the current behaviour for dropdown box 4 and 6.
Happy to look at your form, is you can upload it somewhere like Google Docs and post a link in this thread.
Regards
Bruce