One extra position on front derailleur besides trim After I changed shift cables, I have 4 positions on my front derailleur. WTF?

I have a double chainring. I have a trim position as well, but after shifting to the big chainring, I can still move the STI lever a tiny amount. If I do so, the derailleur will click into a 4th position and the derailleur moves out a tiny amount. From there I can downshift back to the 3rd position.

This only appeared after I changed gear cables and fiddled around with the limit screw. What should I do?
Presumably it is a further trim position if you have double (not triple) shifters, and previously the limit screw was preventing the cable movement. Now you’ve installed a new cable and changed limit screws a bit maybe you’ve allowed access to a high gear trim position. 

My 105 5700 double shifter does the same thing, and I can prevent it from happening by tightening the high limit screw