This isn't a proper question. You need to try to explain your problem in detail. If you aren't a native English speaker, try using a pattern like "I try to do xxxx, and yyy happens." Then tell us the programs and commands you use, the output, and any error messages you get.
Please read the "How to ask a question" page, linked at the bottom of this post.
But assuming I understand your post, then yes, you will sometimes find that conversion to or from document formats will cause problems with formatting. It's not always possible to cleanly translate everything in a document. This is true with all format conversions, not just odt<->doc. Sometimes it even happens between different versions of the same format. That's why most programs give you a warning box when trying to save your document to a non-native format.
There's usually not much you can do about it except try to avoid using the formatting features that don't translate cleanly.