The immediate thing I look at when this kind of stuff happens is rogue morphs/wonky JCMs/etc. Is this happening on multiple figures or just this one?
The easy way is to load the figure with nothing but the pose in question. Go to the parameters pane > Hit the play button with the hamburger menu under it > Preferences > Show Hidden Properties > Make sure you're on the Parameters pane still > Currently Used.
Depending on the pose/figure, there could be quite a few there. Search through the relevant terms. Stuff like "hand", "finger", "carpal", etc. or just scroll through them all and see if any fix the problem. This is usually the problem more often than not, often rooting from a new asset that hasn't been fixed/updated by the vendor. Could have some kind of conflict in the pose settings, as well, but it's a bit unlikely as there's at least some QA by Daz.