Seams to be a bug with MySQLi server behaviors setting a dynamic Select Value Equal to when all the values are static. I will log this as a bug, here is the updated select element code with the select value equal to change made:
<select name="PortfolioSearch" onchange="this.form.submit();" style="width: 380px; height: 40px; font-size: 18px; border: none; background-color: #E74E2E; color: #fff; padding-left: 10px;">
<option selected value="" <?php if (!(strcmp("", ((isset($_POST["PortfolioSearch"]))?$_POST["PortfolioSearch"]:"")))) {echo "selected=\"selected\"";} ?>>Select A Service Section</option>
<option value="Webdesign" style="padding: 5px 0 5px 10px; border: none;" <?php if (!(strcmp("Webdesign", ((isset($_POST["PortfolioSearch"]))?$_POST["PortfolioSearch"]:"")))) {echo "selected=\"selected\"";} ?>>Webdesign</option>
<option value="eCommerce" style="padding: 5px 0 5px 10px; border: none;" <?php if (!(strcmp("eCommerce", ((isset($_POST["PortfolioSearch"]))?$_POST["PortfolioSearch"]:"")))) {echo "selected=\"selected\"";} ?>>eCommerce</option>
<option value="SEO" style="padding: 5px 0 5px 10px; border: none;" <?php if (!(strcmp("SEO", ((isset($_POST["PortfolioSearch"]))?$_POST["PortfolioSearch"]:"")))) {echo "selected=\"selected\"";} ?>>SEO</option>
<option value="Email" style="padding: 5px 0 5px 10px; border: none;" <?php if (!(strcmp("Email", ((isset($_POST["PortfolioSearch"]))?$_POST["PortfolioSearch"]:"")))) {echo "selected=\"selected\"";} ?>>Email</option>
<option value="Copywriting" style="padding: 5px 0 5px 10px; border: none;" <?php if (!(strcmp("Copywriting", ((isset($_POST["PortfolioSearch"]))?$_POST["PortfolioSearch"]:"")))) {echo "selected=\"selected\"";} ?>>Copywriting</option>
<option value="Social Media" style="padding: 5px 0 5px 10px; border: none;" <?php if (!(strcmp("Social Media", ((isset($_POST["PortfolioSearch"]))?$_POST["PortfolioSearch"]:"")))) {echo "selected=\"selected\"";} ?>>Social Media</option>
<option value="Branding" style="padding: 5px 0 5px 10px; border: none;" <?php if (!(strcmp("Branding", ((isset($_POST["PortfolioSearch"]))?$_POST["PortfolioSearch"]:"")))) {echo "selected=\"selected\"";} ?>>Branding</option>
<option value="Marketing Material" style="padding: 5px 0 5px 10px; border: none;" <?php if (!(strcmp("Marketing Material", ((isset($_POST["PortfolioSearch"]))?$_POST["PortfolioSearch"]:"")))) {echo "selected=\"selected\"";} ?>>Marketing Material</option>
<option value="Books and Magazines" style="padding: 5px 0 5px 10px; border: none;" <?php if (!(strcmp("Books and Magazines", ((isset($_POST["PortfolioSearch"]))?$_POST["PortfolioSearch"]:"")))) {echo "selected=\"selected\"";} ?>>Books and Magazines</option>
<option value="Vehicle Graphics and Signs" style="padding: 5px 0 5px 10px; border: none;" <?php if (!(strcmp("Vehicle Graphics and Signs", ((isset($_POST["PortfolioSearch"]))?$_POST["PortfolioSearch"]:"")))) {echo "selected=\"selected\"";} ?>>Vehicle Graphics and Signs</option>
</select>
