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Apology. Now I noticed that the colon is missing

As I wrote, the same thing happens with https.
Pictures in attachment.

I have a problem with putting a link on a page. I am getting an error.
Upon inspection, I found that the address of my website is added before the address of the link.
For example:
My website address: www.abc.com
Link to the page: www.xyz.com

When clicking on the link, it tries to connect to www ...