That looks like the Breen set visuals to me. Press U and click your ship. Where you equip shields, engines and deflector you can right-click on them to disable visuals and your ship will look "as you coloured it".
Several sets in-game will alter your visuals unless you tell it otherwise (in fact, I think all of them do).
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Aside from the Assimilated set making your ship look... well, assimilated, I've never quite understood this feature. Like, how does a Breen shield transform your ship's hull to use Breen materials and your warp engines to glow like they're of Breen design? It also overrides any custom colors or hull materials you put on the ship itself. I'm sure some people like it for what it is, but it just seems odd to me. One more thing I have to remember to do whenever I swap equipment.
The way I'd rather see it done is for it to unlock as a new material in the ship tailor when you complete the sets. Same way the ground costumes work. That way, people who like it can use it regardless of what equipment they have on at the time, and those of us who don't like it can simply ignore it instead of having to fix it every time we change equipment.