ASM adding unwanted cookie

Hi, we have a VS created in LTM with Default Persistence as universal & following iRule:

when HTTP_REQUEST {
        if { [string tolower [HTTP::path]] starts_with "/abcd" } {
                pool Pool1
        } else {
                  set jsess [URI::query [HTTP::uri] PARAM]
                  if { $jsess != "" } {
                       persist uie $jsess 600
                       pool Pool2
                    }
        }
}

However, we are getting one unwanted cookie in response, so is it possible that above combination will add some unwanted default cookie for response?