Hello there @Jac_Freeman!
From the looks of your screenshots, and without knowing the full extent of your setup and materials, there are a few general methods from the UE community, to try for the ghosting effect you are seeing. Let’s cover them one by one:
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First of all, the most usual cultrip, your current AA method. Check your Project Settings > Rendering, and confirm your AA method, which is most likely FXAA. Test with TSR, TAA, and None. One of these settings could remove the trails altogether
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Next, open your master material, go to Details >Transparency, check if Output Velocity and Responsive AA are enabled. If not, enable them (if they are greyed out, you may need to temporary change your material’s blend mode to Masked). This should help thin meshes to retain their shape during camera movement, avoiding the trails
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Another possible cause, is motion blur. Open your post-processing volume, and check the values for motion blur in your scene. Test by reducing or, disabling them fully
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FInally, if all fails, you can try slightly increasing the thickness of the affected meshes. A small bevel could be enough to prevent the ghosting effect
For further testing, there’s another thread with a ghosting scenario, please give it a look: