Microsoft Word

The problem is this:  When I am proofing a document after it is written, it will stop on any green or red lines and a box will pop up which has a variety of options on it; e.g. "ignore once."  When  I click that, the scan proceeds forward to the next "error."  Ultimately, a box pops up and says something like "finished" or some such.  So everything is OK and I save it and close the document.  But, at a later time when I reopen the document, it automatically re-edits the document and brings up the green and red line "errors" again, just like it was before I corrected it.  I don't want it to automatically re-edit the entire document - only anything I might add to it.  Thanks