Obejcts in animated mesh get scaled up

I’m importing an animated fbx from Blender into UE. The fbx is composed of several meshes, 3 separate armatures - body, right arm, left arm, the last two children of the first - and an animation. When I import it into Unreal, the arms, which are linked to the two arms armatures, get blown out of proportion. If I import the whole thing without the animation, it looks splendid. Transform is applied on everything and everything shares the same origin point (and even when not, it makes no difference). Good karma to the solvers.

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