It looks like your "bone chain" is not connected.

Did you "click & drag" >>> "click & Drag", etc., etc. to make ALL of the bones at the same time ... without doing any kind of other operation inbetween bones?

dg
;=?

Remember ... "With Poser, all things are possible, and poseable!"

cheers,

dr geep ... :o]

edited 10/5/2019