Do you have a photo? How do the leaves look. What size are they.

The 3 photos in the middle are to illustrate how S-shaped or C-shaped the other two Pritchardia thurstonii are.

I am afraid curved palms may mean weak genetics and they may grow up to remain curved, which I do not like unless I have many more of each, but I usually collect 1 or 2 only. Wonder if curved palms straighten up. From my experience they don't, but my experience is based on growing Washingtonias and other cold hardy zone 8-9 palms before, and not these kind of tropical ones.

Please advise. Thank you.

I don't think you'll have any problems with those. Since you only recently got them like that my guess would be they were germinated in a crowded community pot and were competing with one another to get to the light. So some would have ended up curved. I doubt it'd be a genetic deformity. I've got a couple of Pritchardia pacifica that are starting to trunk now. Long before yours get to the size of mine any curvature will have disappeared.