The bullet items showing as numbered lists are a common 'challenge' when updating to RH8. There've been a lot of posts about this. Please search the forum.
It's probable that most style issues come from the update from HTML to XHTML.
It may also be worthwhile to get the backup of your V5 project and update it again. You can check if the update somehow went wrong.
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I will give it a try. We are also using Source Control. Any cautions for checking back in?