Cookie value not saved

At some point, my cookie storage broke.  This function sets a value to “1”.  After calling it, I can see that Application.Cookies has saved the value.

public static void SaveNeverShowAnonIssueRepored(string value)
{
Application.Cookies.Add(“nsa_showanonissuereported”, value, DateAndTime.Now.AddMonths(6));
}

However, when I check the value later, it has been set to “0”, even in the same session.

public static string GetNeverShowAnonIssueReported()
{
string strResult = Application.Cookies[“nsa_showanonissuereported”];
if (strResult is null)
strResult = “”;
return strResult;
}

Why would this be?