Unable to figure out how to remove url appendages like -1, -1-1, -2, etc...

We are struggling to clean up some of the URLs on our site with EasyBlog. I know that the appended string is because of 'duplicates' but we are struggling to figure where the duplicates are coming from.

Here is a url in question:
https://www.drcarney.com/blog/entry/association-between-dietary-fiber-intake-and-risk-of-coronary-heart-disease-a-meta-analysis-2

What we want is to remove the -2 from the url. But, each time we click on the edit button and then remove the -2 we find it is added back when we "Update Post".

Since I know I need to find duplicates I have been looking to see if maybe a copy was in unpublished but have not found any. I also looked in trashed and did not find any. So, I thought it must be in the History tab and I deleted EVERY revision except the one I was working on. But, that also did not allow me to change the URL.

I am hoping you can give me a clue as to what we are doing wrong. Or, do you think maybe this is just something that is getting stuck in the Joomla cache? or the EasyBlog cache?

any ideas will be greatly appreciated.

Sean