If you have Confluence Source Editor, which will appear in a page's Edit view as <> in the upper right corner of the screen, you can fix the HTML itself. Most likely something got copy/pasted into the table and caused it to become off.
Other than experimenting with deleting columns/rows, Source Editor is really going to be your best bet for fixing this.
If you don't have/see the <>, Confluence Source Editor is absolutely worth getting. It's free. If you're not the Confluence administrator, it's possible that Source Editor is installed but just not showing since it can be made visible for certain groups of users.
The <> will not appear on new, unpublished pages, though, only on existing pages to be updated.
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