如何阻止 mod_rewrite 将链接附加到 url?

I wanted to change my links from things like domain.com/?p=about to domain.com/about*/* (with the trailing slash) and it works fine, but whenever I move on to a link, it appends the new link to the back of the url. For example, I have an about and a contact link. If I click about it navigates to domain.com/about/ then if I click contact, it navigates to domain.com/about/contact/ and will keep adding the links to the end of the url. If I'm at domain.com and click a link(about, in this case) it will go to domain.com/about/ and if I click about 4 more times, my address bar is going to say "domain.com/about/about/about/about/about/" I have reproduced this in a very simple example below, what am I doing wrong?

.htaccess

RewriteEngine On
RewriteRule ([a-zA-Z0-9]+)/$ index.php?p=$1

index.php

<a href="about/">about</a> | <a href="contact/">contact</a><br><br>

<?php
    if(!isset($_GET['p'])) {
        echo "home";
    } else {
        echo $_GET['p'];
    }
?>

感谢您的帮助！

如果我使用绝对路径，它可以正常工作，但如果我不是绝对必须，我宁愿不要.

RewriteBase /

<a href="about/">about</a> | <a href="contact/">contact</a><br><br>

<a href="/about/">about</a> | <a href="/contact/">contact</a><br><br>