I'm just writing an RSS feed generator and installed NEWSFOX for
testing purposes. While in general looks everything OK, I do not know
why titles are crossed except the first:
Other feeds are normal and my feed is OK with other eraders as with the
feed validator online.
A title is crossed out in NewsFox when there is no <RSS:guid> or <atom:id> tag associated with the article. The <guid> tag is not required in RSS, but NewsFox needs it in order to keep track of articles. If the <link> tag is unique, NewsFox will use that as a guid.
Title are also crossed out when deleted, but this can't be the case in your situation.
If this doesn't help, could you post an example feed(or excerpt). Thanks, R Pruitt