Quick links webpart will not open link

abdulhadi10 I just encountered this as well and it appears to happen when you paste in the page name for the site that you are linking to when it is being created which causes special characters to be appended to the beginning of the URL (in my case, the characters were %E2%80%8B).  Note that if you try to go to the path of the page by typing it into the browser without these characters, you will receive a 404 not found message.  When selecting a page with this issue to put in the quicklinks, I'm guessing it is throwing an error because it doesn't recognize the special characters and removes the malformed URL.  The fix for this is to rename the page that you are attempting to add to the quicklinks by deleting out the existing page name and manually re-typing in the page name.  You should then be able to link to the page without issues.