error 404 message

When clicking on the edit listing option after clicking My Listings and selecting a property to edit. I get the 4040 error message. Looking at the url it reads https://89.187.85.29/~inmobili/listing/apartmen-magdelena-arboleas/&eid=727

Looking at another site I have, the & in &ied is ?eid and this works when I replace the & with ? The site was working fine when I last used it to edit a property. Any idea how this & has got into the url?
The listing loads fine it is just the edit page that returns the 404 message.