Resting heart rate, adjust after a while in the morning?

Garmin Says: 
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Thank you for contacting Garmin Support.  The number you see on the Garmin Connect Mobile App "My Day" page for heart rate listed as "Resting" is the 7 day "rolling" Resting HR value. 

By design, when you wake up you will see this number as it relates to your last night's sleep's RHR.  As the watch further determines your sleep window from last night it may make an adjustment to that number that better correlates to the rolling average Resting Heart Rate.  This is basically the same as the way your sleep statistics will often see a similar recalculation after a period of time has passed after waking and the watch recognizes you are definitely no longer in a sleep window.   

Explained here:  "Sleep windows may recalculate throughout the day to verify and distinguish between waking up early and going back to sleep vs being up for the entire day. You may notice slight variances in your complete sleep window as these calculations update. Even with these recalculations, sleep monitoring can still stop if the device detects movement that indicates you've entered an "awake" state for an extended period of time during the night."  from this article on sleep statistics:  Viewing Sleep Statistics and Details in Garmin Connect

So basically, once you are up and moving around for the day, the watch will replace the "Resting" number with the new calculation of the 7 day rolling value for Resting HR. 

I hope this helps, it's a bit difficult to explain but what you are seeing is by design and not any sort of error.  

Thank you for choosing Garmin,

*Name*

Product Support

Garmin International

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So there we go a little bit of both, thanks Garmin!