Wrong route selected in ASP.NET MVC 3 - asp.net-mvc-3

Question

Could please someone shed some light into this issue, it drives me crazy!
The routes:
public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.MapRoute(
"DefaultOrderingRoute", // Route name
"{controller}/{action}/{id}/{slug}", // URL with parameters
new { controller = "Order", slug = UrlParameter.Optional }, // Parameter defaults
new { controller = "^Order$" }
);
routes.MapRoute(
"DefaultImageRoute", // Route name
"{controller}/{action}/{id}", // URL with parameters
new { controller = "Image", }, // Parameter defaults
new { controller = "^Image$" }
);
routes.MapRoute(
"FooterRoute", //route for invoking actions for the Footer
"{controller}/{action}", // URL with parameters
new { controller = "Footer", }, // Parameter defaults
new { controller = "^Footer$" }
);
routes.MapRoute(
"DefaultDealRoute", // Route name
"{city}/{category}/{id}/{slug}", // URL with parameters
new { category = Deals.Globals.Global.CATEGORY_ALL_NAME, controller = "Deal", action = "Details", slug = UrlParameter.Optional }, // Parameter defaults
new { controller = "^Deal$", id = #"\d+" }
);
routes.MapRoute(
"DealRouteForCategory", // Route name
"{city}/{category}", // URL with parameters
new { city = "", category = Deals.Globals.Global.CATEGORY_ALL_NAME, controller = "Deal", action = "Details" }, // Parameter defaults
new { controller = "^Deal$" }
);
}
I have add a reference to routedebugger to see what is going on under the hood.
So for the selected URL:
http://my.SERVER.IP/VirtualDirectoryName/Order/PayPalNotify/9/blabla
the URL debugger shows the following:
AppRelativeCurrentExecutionFilePath: ~/Order/PayPalNotify/9/adfaf (exactly what i have expected)!!!
The debugger also shows that routes DefaultOrderingRoute and DefaultDealRoute are matched (this i didn't expect! since i have constraints on the routes!!).
It also shows that the matched route is:
Matched Route: {controller}/{action}/{id}/{slug}
with route data:
controller: Deal
action: Details
id: 9
slug: adfaf
city: Athens
category: All
How is this possible?? What am i doing wrong?
PS. I've noticed that by reissuing the URL the correct route gets executed!!!

Answer 1

Mystery solved: i was doing something very bad(!):
in Session_Start() i had somewhere code which did the following (amongst others)
Session_Start()
{
// code snippet out for brevity
//setup the city route values
HttpContext.Current.Request.RequestContext.RouteData.Values["city"] = cityToBeginWith;
//setup the category route values
HttpContext.Current.Request.RequestContext.RouteData.Values["category"] = Deals.Globals.Global.CATEGORY_ALL_NAME;
//setup the controller route values
HttpContext.Current.Request.RequestContext.RouteData.Values["controller"] = "Deal";
//setup the action route values
HttpContext.Current.Request.RequestContext.RouteData.Values["action"] = "Details";
}
This caused the selection of the "false" route... very bad!!