PHP mySQL multiple dropdowns leading to same page?

I have a webpage with two drop-downs and one search bar. The dropdowns and search bars are all different programs and I'm including those files into my main webpage. The dropdown that I include first on my webpage, if I select an option and it works right based on the "form action". The second dropdown and the search bar also return the same results as if I was using the first dropdown (though their "form action" files are different). I tried changing the order and turns out it always defaults to the formaction of the first navigation bar)!!

Here is what I have included-

include_once("DropDownVendor.php");    
include_once("DropDown.php");
include_once("searchbar.php");

---

Here is the form action for the first include(dropdown 1)-

echo "<form action='processformvendor.php' method='POST'> <select name = 'fieldname1'>";

Here is the query to bring results-

$query = "SELECT * FROM Deals WHERE vendor= \"{$_POST['fieldname1']}\"";

---

Here is the form action for the second include (dropdown2)-

echo "<form action='processform.php' method='POST'> <select name = 'fieldname'>";

Here is the query to bring results-

$query = "SELECT * FROM Deals WHERE dealcategory= \"{$_POST['fieldname']}\"";

---

Here is the form action for the second include (search bar)-

<center>

    <form action="searchresults.php" method="get">
    <input type = "text" name = "keywords" autocomplete = "on" placeholder = "Search for deals" size = "70" />
    <input type = "submit" value = "search" /

Here is the query to bring results-
    if(isset($_GET['keywords']))

           {$keywords = $_GET['keywords']

            $query = mysqli_query($conn,"SELECT * FROM Deals 

            WHERE 

            vendor LIKE '%$keywords%'

            OR description LIKE '%$keywords%'");