Steps to Reproduce:
Login to zanata.
Go to dashboard.
Click on ... on top right corner.
Click on TM Merge Translation option.
Once TM Merge pop-up opens you will see three checkbox on the start/top.
Select any of the checkbox.
Try to check another checkbox/click anywhere in pop-up
Observe the behavior
Pop-up should not be closed on second time mouse click
Pop-up closed automatically on second time mouse click/second checkbox check.