Google Search Analytics desktop site to losing page position compared to the mobile version of the site

[merch_zzounds]

Looking at Google Search Analytics page position by device.  The desktop version has seen a dramatic drop in the last 60 days compared to the mobile site.  Could this be caused by mobile first indexing?  Has Google had any releases that might have caused this?

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[merch_zzounds]

Thanks Jim,  When I said drop that was page rank as I have been tracking through Google Search Console search analytics.  We have an adaptive site that detects the users equipment.  I URLs are the same in both environments.    When I look at desktop the average page rank dropped 4 positions taking us off the front page while the average position on mobile dropped a half a position.  Does that help?  Thanks