Description of problem:
When the ansible rex runs (roles or commands), the execution log via the web ui will show the tasks getting repeated (including fact gathering) intermittently if the hyperlink of the target remote host is clicked before the execution completes.

 
How reproducible:
~80% - this seems to happen intermittently

Is this issue a regression from an earlier version:
Appears to be as I do not see the behavior in 6.14, but it shows in 6.15
 

Steps to Reproduce:

1.Execute ansible REX via the web UI (ansible command or Roles)

2.Click the hyperlink of the target remote host before the rex completes

Actual behavior:
The status log shows the tasks are getting executed multiple times

Expected behavior:
The status log should show the task execution once

Business Impact / Additional info: