Guid gets overwritten on form submit - asp.net-mvc

Question

When I load this form
#using (Html.BeginForm()) {
#Html.AntiForgeryToken()
#Html.ValidationSummary(true)
<fieldset>
<legend>Category Description</legend>
#Html.HiddenFor(model => Model.ID)
#Html.HiddenFor(model => Model.CategoryID)
#Html.DisplayFor(model => Model.Language)<br />
<div class="editor-field">
#Html.TextAreaFor(model => model.Text, new {} )
#Html.ValidationMessageFor(model => model.Text)
</div>
<p>
<input type="submit" value="Save" />
</p>
</fieldset>
The fields have the following values:
But after submitting the form, in the POST Method, the ID gets overwritten by the other Guid and the Language Field is null.
The Data Model looks like this:
public partial class Category_Description
{
public System.Guid ID { get; set; }
public System.Guid CategoryID { get; set; }
public string Language { get; set; }
public string Text { get; set; }
public virtual Category Category { get; set; }
}
What did I do wrong?
EDIT:
On Request the Post-Method:
[HttpPost]
public ActionResult CategoryDescription_Edit(Category_Description model)
{
if (ModelState.IsValid)
{
var result = dataService.SaveChanges(model);
if (result)
return RedirectToAction("Index");
}
return View(model);
}
And just in case the dataService.SaveChanges as well:
public bool SaveChanges(object model)
{
Portal_Context.Entry(model).State = EntityState.Modified;
return Portal_Context.SaveChanges() > 0 ? true : false;
}

Answer 1

The hint of #DanielJ.G. set me into the right direction.
The problem was the name of the parameter I used for the
#Html.ActionLink( ...., new {id = Model.CategoryID}, .....)
and the corresponding
public ActionResult Category_Delete(Guid id)
As soon as I renamed "id" to "category_id", the ID did not get overwritten anymore.