I just try your command out. I changed it to the way I like to do it, and added a pause, because the tabs weren't all being counted on the webpage. Going by your command. You want to go to that page, and hit tab 35. That makes the tab stop at Conductive Polymers. I didn't have a lost of focus once with chrome in the process of getting this to work.
Not sure why you are losing focus. I added a couple of things to the command to help diagnose what windows title it's focusing on. Maybe you have another command or program being triggered in some way.
Run the command and then check your log, the first will tell you what title VA first, and the rest, what it's focus is the rest of the time. See if there is any difference.
Run application 'C:\Program Files (x86)\Google\Chrome\Application\chrome.exe' -with parameters 'inara.cz/cmdr-cargo/33540' - wait until it starts
Set small int (condition) [todo] value to 35
Pause 2 seconds
Write '[Blue] {ACTIVEWINDOWTITLE}' to log
Start Loop While : [todo] Does Not Equal 0
Press Tab key and hold for 0.1 seconds and release
Set small int (condition) [todo] value as decremented by 1
Write '[Blue] {ACTIVEWINDOWTITLE}' to log
End Loop