It seems that code block 2 is inserted into this RSS feed:
http://www.solvibrations.org/DIY/marketing-advertising/feed/
Make sure RSS Feed is disabled for code block 2 (button Misc):
https://adinserter.pro/documentation#misc

Hi Igor,
Thank you so much for answering. I’ve been playing around with your suggestion, but I could not get it to work. Can you please help me?
Have you disabled insertion for RSS Feed for code block 2 and cleared cache or regenerated RSS feed?
I actually don’t know how to do this kind of thing. So, I’ve asked a friend to help me do it. He said that he followed what you said, but it still did not work.
You still have code block 2 inserted in the RSS feed.
Please enable remote debugging
https://wordpress.org/support/topic/please-read-how-to-ask-for-help-2/
Remote debugging has been enabled.
It seems you have not rebuilt the RSS feed:
<lastBuildDate>Thu, 14 Sep 2017 16:05:03 +0000</lastBuildDate>
An easy trick that works sometimes – Login to your WordPress admin area Settings -> Reading and change the number in ‘Syndication feeds show the most recent‘ option, this also updates the RSS feed. Once feed is updated, you may change the number back to whatever it was before.
You can also update any existing post to force recreating the RSS feed.
Check the lastBuildDate of the feed to make sure it was updated.
I’ve done everything you’ve mentioned, but I do not know how to check lastBuildDate, to confirm.
I have it now. Yes, it was updated, but still the same issue. <lastBuildDate>Mon, 18 Sep 2017 16:06:19 +0000</lastBuildDate>
This looks strange.
Please submit a ticket and mention this thread.
Just sent in a ticket. Thank you! 🙂
Should I leave on the remote debugging option?
Fixed by black-listing urls */feed/.
Fantastic! Greatly appreciate it, Igor. 🙂