Styles changing by themselves???

Can anyone advise me how certain Font aspects seem to change by themself?
Sounds weird I know!
For example, this page http://www.dinningtonrugby.net/laws/laws.htm has been
on my site for about 6 weeks without any changes, but looking at it today the
font size at the beginning of each paragraph, ie the words 'ruck' and 'maul'
have changed to a small font size without being changed by me - I haven't even
opended the page for weeks for editing.
Also if you look at
http://www.dinningtonrugby.net/junio...es_results.htm you can
see the words 'Wheatley Hills' in Red on the right hand side of the page.
Again, this hasn't been changed and is on a template used by all other pages -
but has gone red for some reason. The last time I had this the code had changed
to tell the text to be red, but I hadn't changed it.
If anyone could help I would be grateful, as this has happened on numerous
occasions.

.oO(sbott)

For example, this page http://www.dinningtonrugby.net/laws/laws.htm has been
on my site for about 6 weeks without any changes, but looking at it today the
font size at the beginning of each paragraph, ie the words 'ruck' and 'maul'
have changed to a small font size without being changed by me - I haven't even
opended the page for weeks for editing.

Caused by

..style23 {font-size: 10px}

in the style-section in the document's head.

Also if you look at
http://www.dinningtonrugby.net/junio...es_results.htm you can
see the words 'Wheatley Hills' in Red on the right hand side of the page.

Caused by

<style type="text/css">
<!--
..style17 {font-size: 11px; color: #FF0000;}
-->
</style>

Micha