How to reproduce:
Register as a seller, you will receive an email with an activation link:
"You have successfully registered to Dakor on March 15, 2019 10:10 AM GMT.
Please activate your account on activation link with Password"
The activation link comes through like this: https://www.dakor.ie/http
I checked the issue you reported, on our local server and on your site also, but unable to reproduce this issue.
Kindly, inform me the steps you followed which led you to this issue.