Wikimedia Bugzilla is closed!

If you enter a tag and hit go, you get some results (or not). If you then change the tag and hit go, you get the same results and the same tag in the tag filter box - the URL is something like http://el.wikipedia.org/w/index.php?namespace=&tagfilter=SWMT-blanking&tagfilter=SWMT-vandalism&title=%CE%95%CE%B9%CE%B4%CE%B9%CE%BA%CF%8C%3A%CE%A0%CF%81%CF%8C%CF%83%CF%86%CE%B1%CF%84%CE%B5%CF%82%CE%91%CE%BB%CE%BB%CE%B1%CE%B3%CE%AD%CF%82 (so, I guess the old &tagfilter= isn't being removed, and ends up last in the URL, and the last &tagfilter= is being honoured)

Presumably this applies to the other places you use tag filtering too.