HTML Codes are no longer working on my site

All the HTML codes are not working anymore on my website. See an example on contact form. This is what visitor see. <span style="color: #444444; font-family: Varela; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">[form to="[email protected]" subject="Subject"] [form_element type="text" validate="required" options="" placeholder="Name"] [form_element type="text" validate="email" options="" placeholder="Email"] [form_element type="textarea" validate="" options="" placeholder="Query"] [form_element type="submit" validate="" options="" placeholder="Submit"] [/form]</span><b></b><i></i><u></u>