I honestly have no idea when or why it started, but I’m getting multiple meta tags generated for my WordPress posts.
I’m running BlackMag on the latest version of WP.
My Plugins are:
Advertising Manager
Akismet
BackWPup
Better RSS Widget
Contact Form 7
Display Authors Widget
Dynamic Widgets
Easy Social Share Buttons for WordPress
Exclude Pages from Navigation
Featured Image In Rss Feed
Go Daddy Quick Setup
Google Analytics
Google Tag Manager for WordPress
Insert Headers and Footers
iThemes Security
Jetpack by WordPress.com
P3 (Plugin Performance Profiler)
Pretty Link Lite
Restrict Widgets
Sexy Author Bio
SumoMe
TinyMCE Advanced
Ultimate Tag Cloud Widget
User Role Editor
W3 Total Cache
WP-Optimize
WP Mobile Detect
WP Post Template
WP Smush
WP User Avatar
Yoast SEO
If you are talking about the double analytics code – did you, by any chance, inserted it as pure code (hardcoded or with analytics plugin), and then – once again, with Google Tag Manager?
I don’t see any doubled meta tags, anywhere…