MVC Post Action Method is calling when using @Html.Action
Please follow up the steps below to solve the issue:
1. Avoid using @Html.Action from the Layout page (shared folder)
2. If you are using Ajax calls with the POST method inside the main page, please be sure the assigned Url has a valid value, otherwise the system will load again the same page but with the post action, that's why when it loads the partial page inside the main page with the @Html.Action it is calling the Post Action method.