Line breaks on seperated Tags
This is just how out of the box drupal styles the tags fields.

You can fix it by overriding the themeing of your tags in your theme, but the easiest way I have seen to fix it is by using the Text list formatter module.

Install that then go to the display settings for your content type and there will be a new option "List", which then has further configuration options that can give you the output you desire.