help htaccess kept writing new code (122 pages)

Hi Ishyoboy,

I had an internal server error 500 yesterday and the godaddy web support troubleshoot and renamed the htaccess file. After WP wrote a new file the website was ok again but I just wanted to know what was the cause so I don’t do it in future. He said it could be a permalink conflict problem. My WP set to permalink post name, and the Yoast seo was set to remove stop words. The code in htaccess had 122 pages of code (I started the website about 2-3 weeks).

This is the code
# WordPress SEO – XML Sitemap Rewrite Fix
RewriteEngine On
RewriteBase /
RewriteRule ^sitemap_index.xml$ /index.php?sitemap=1 [L]
RewriteRule ^locations.kml$ /index.php?sitemap=wpseo_local_kml [L]
RewriteRule ^geo_sitemap.xml$ /index.php?sitemap=geo [L]
RewriteRule ^([^/]+?)-sitemap([0-9]+)?.xml$ /index.php?sitemap=$1&sitemap_n=$2 [L]
RewriteRule ^([a-z]+)?-?sitemap.xsl$ /index.php?xsl=$1 [L]
# END WordPress SEO – XML Sitemap Rewrite Fix
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

The code in bold will just repeat itself for 121 pages and finally the server probably came out error 500. Any idea how this might happen?