URL Field Not Opening Correctly - CRM 2013

I have created a single line of text field (URL) and have populated the field on all accounts.

The problem am experiencing is that when clicking link within CRM, it amends my url link and takes you to a different location. If you copy and paste into web browser it works ok.

Example;

I've added the following url to new field -

but when it opens via CRM, it goes to;

Any ideas why it's behaving in this manner?