Cannot change permalink/slug "-2" appends automatically

So I created a page and I am 100% sure that the permalink of the page was /go/install-and-license-version-1-5/. I am sure because I copied that link into a bunch of emails and sent it out.

Today I was updating the text in the page and when I pressed the Update button the permalink changed to /go/install-and-license-version-1-5-2/.

If I goto /go/install-and-license-version-1-5/ it gives me a 404 error.

This is what I have already tried.

1. Deleted thrash
2. Deleted drafts
3. Tried to recreate a new page with the same permalink, it makes it /go/install-and-license-version-1-5-2-2/
4. On Yoast SEO tried to create a redirect and receive the following message “The old URL already exists as a redirect.”
5. I checked and see no redirects created in yoast or .htaccess.

EDIT: I searched the database and found the following in wp_options

SELECT *
FROM xxxxxx.wp_options
WHERE (
CONVERT( option_id
USING utf8 ) LIKE ‘%go/install-and-license-version-1-5%’
OR CONVERT( option_name
USING utf8 ) LIKE ‘%go/install-and-license-version-1-5%’
OR CONVERT( option_value
USING utf8 ) LIKE ‘%go/install-and-license-version-1-5%’
OR CONVERT( autoload
USING utf8 ) LIKE ‘%go/install-and-license-version-1-5%’
)

Any help?