The "Track Pets" tick box on the pet pane needs moving. It overlaps the "Summon" button, though is still usable by clicking the "Track Pets" wording instead of the tick box.

It is also conflicting with Rematch. When Rematch is unticked, it is impossible to click Rematch.

I'll post this second issue on the Rematch site too.

That is some addon interfierence. The button is not located there when other addons are disabled.