Trello board on Safari keeps asking for login credentials

Issue Summary

The Trello board on the Safari browser keeps asking for the login details even after page refresh.

Steps to Reproduce

1. Create a page having a Trello Board macro.
2. Open it in the Safari browser and login into the prompt.
3. Close out the small window of Trello prompt post-authentication.
4. Refresh the page and it will end up on the same page requesting login details.

Expected Results

It should load the macro on the page without requesting for sign in.

Actual Results

It asks for login after page refresh.

Workaround

It's working fine in firefox and chrome.