Description field has a parameter named "Parse URL as link in Details view" that allows you to parse any text that resembles an URL as a clickable link. This is a handy feature when you're not using a WYSIWYG editor to write the descriptions for your listings.

However, this can cause problem in rendering your description when you disable "Strip all HTML tags in Details view" in the field, especially when your description contains anchor tag for your links. If you're not stripping HTML tags in details view, make sure you set "Parse URL as link in Details view" to No.

Here's the recommends parameter configuration for Description field:

Strip all HTML tags in Details view: Yes
Parse URL as link in Details view: Yes

Or

Strip all HTML tags in Details view: No
Parse URL as link in Details view: No