Google Tag Assist Errors

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I have recently added the Google Tag Assist extension to my browser and it is showing a few errors on my website that I would like advice on please? 

Google Analytics - No HTTP response detected
I have checked Analytics and it appears to be working as is showing people on the site in real time so I don't know if I need to do anything regarding this? 

Two Global site tags (gtag.js)
I'm not really sure what these are for but one is green and then other blue? 

Any assistance would be greatly appreciated.