The Rotate IP feature can be enabled in the project's Settings tab, and is exclusive to premium ParseHub users. Unless you have a reason, don't turn on IP Rotation. If you aren't certain, Contact Us to have a look at your project.
This feature should not be always enabled. In most projects, it will slow down your runs without any benefit.
When you should use IP Rotation
You can check if this is happening by using the Server snapshot feature on a few templates.
When a run is finished you can see the snapshots that the server takes of what it 'sees,' at each point in the run where you add the command. These are found on the Run page.
If you get a screen something like this, or with a captcha, in a server snapshot, this means that you may need to turn on IP Rotation.
If this still fails to fix the issue, you might need to add further wait commands at various points in the project, especially between click, hover, scroll, and go to template commands. Anything that interacts with the page is likely to be noticed by IP blocking scripts.