Custom Field name merges with its value

Behaviour:
When the user creates a custom field (Text Field) with really long name, example:

Loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooonnnnnnnnnnnnnnnnnnnngggggggggggggg oooooooooooooooooooooooonnnnnnnnnnnnnnnnnnnggggggggggggggggggg custom field.

it will merge together with the value of that custom field in the "View Issue" Screen. Replicated on 4.4.4 but there was no issue with it. Replicated on 5.0.2 specifically and the problem occurs.

Steps to replicate:
1. Create a very long custom field name

• type: text field
• ie: Loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooonnnnnnnnnnnnnnnnnnnngggggggggggggg oooooooooooooooooooooooonnnnnnnnnnnnnnnnnnnggggggggggggggggggg custom field.
  2. Associate with a screen (Default, Resolve Issue, or Workflow)
  3. Try to create an issue and insert a value into the custom field
  4. View the issue to see the behaviour

Kindly view the screenshot for further explanation.