Page declares more than one canonical tag
A canonical tag tells search engines which address is the "real," preferred version of a page, and a page should only ever declare one. This check flags pages that declare more than one canonical tag at once. On this site, one or more pages have this conflict.
Why this matters
Two canonical tags give Google contradictory instructions about which URL is preferred, and it may pick one arbitrarily or ignore both, which undermines the reason for having a canonical tag in the first place. This is a common conflict caused by a CMS plugin and theme both adding their own canonical tag.
How to fix it
Your developer should find and remove the duplicate canonical tag so exactly one remains per page. A common cause is a plugin or theme adding a second one; if your site uses a CMS such as WordPress, check for an SEO plugin conflicting with the theme. This is usually a quick fix once the source of the duplicate is found.
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