Why are my MetaHumans so angry when I change skeletal mesh from MetaHuman Identity (funny but annoying bug)

I am having an issue with MetaHuman. I am trying to create an animation using recordings of myself for use on other MetaHumans. Note I am very new to this so some of it may seem a bit noobish. I record my animation and it works on my Identity FaceMesh just fine, and it should transfer to other meshes happily. However when I change Skeletal Mesh or use it on another mesh, the character looks, well… lets say angry…

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And this is what it looks like when the character is talking. When its my identity assigned to it its fine but it looks like this when I assign another mesh…
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I’ve tried a lot of things including recording closer up with higher quality but still the same results no matter what I do… I recorded my footage with an iPhone using LiveLink. What am I doing wrong? I am following the tutorials very closely and from what I see I’ve done everything it says I should do…

Please help me with this, whilst it seems like a funny glitch its bloody annoying since I have a deadline to do this animation in!