After second set cursor could jump to third set
After second set cursor jumps to "Preview SQL" button
It seems to work fine for me, what version do you use?
It's strange, but in current configuration it work's fine:
Version information: 4.6.4
Browser: Google Chrome for Ubuntu 16.04 LTS (google-chrome-stable)
Possible it was related to browser.
Okay, let's close it now, in case you can reproduce this again, please note versions where this did happen so that we can take a look.