Not a big deal, and no adverse effect, but you may want to clean up... (unless this was done on purpose?)

When Advanced Search check box is checked, Note the query string has ...As=...  twice
   As=true&As=false

e.g.
/search?Q=&As=true&As=false&Cid=30&Mid=1&Pf=&Pt=&Sid=false&btnsearch=Search