Here are a couple street views of some interesting things this string does.

Streetview One.
Streetview Two.

In the first picture you see how it goes from a single wire from the power plant to a bundled wire on the other side, and the other one stays the same.

The second one just shows what happens and both shows.

I've seen both single and V-configurations with Bundled conductors. but only the Middle phase on the left circuit being V is odd.

Maybe the cable has been replaced at some point and the new cable was heavier, thus requiring an extra insulator to handle the weight.

That's the only possibility I can imagine, but hey, I'm no expert in high voltage stuff, and more generally anything over 600V LOL.

This could be one of them wind shiftier calculations

Near where I live they have another set of lines with towers just like this, with a single V on one side and the rest just suspension, all 6 cables are bundled, but the side without the V I can tell had the bundled wires added later, because of how they are mismatched. As the side that has the single V configuration has the bundles wires side by side (horizontal) and the side without has the bundled wires one on top and one on bottom (vertical). There is one set of towers that go north that have two V configurations, one on both sides in the middle phase, and both circuits are bundled and built at the same time.