here in the bugs web, the default button is "change form" rather than "save" (or nothing). Thus if one slaps [enter] after filling in any of the fields other than 'Details' instead of saving the entry one is taken to the change form page.
Should be fixed, but not right now. Deferred.
Undeferred, post Dakar CC
Since we switched over to using the topic body for the report, this default behaviour is less of an issue. Discarding.