Private PublishersPublic Publishers
As a rule, there is a fixed period during which the publishing house has the sole right to the work. Once these conditions have been met, the writer can withdraw or claim back the copyright to the work. If this is the case, the writer is free to send the work to another publishing house.
Even if the first US printing privileges were conceded to the initial publishers, the authors are free to contact other publishers (Great Britain is considered foreign) and also conclude a publication there. It' s not unusual for a single publication to be produced in different jurisdictions by different publishers.
As soon as the publication has entered the official market, any publishers can make the publication available to their readership. It is by far the most frequent means by which several publishers release the same work. Usually, if a publishers thinks they have a one-of-a-kind chance to release and support an older work that is publicly accessible, then it may be a worthwhile investment in their own work.
So if the work with the same name is released and acknowledges the same writer, then there really is no mistake, because the writer still gets a loan. Benefiting from the author's fame, the publishing house is honored for spending a lot of effort and cash to support the work. When the publishing house decides to keep the same name, essentially the same contents, and then publish the text under a different name, ethics issues come into the picture.
The addition or modification of some words or even just some sections does not represent a new work and does not give the new "author" the right to use the entire work. When the new writer decides to accept the former writer and renounces that it is a derived work on the basis of the earlier effort of the former writer, then that would be deemed reasonable.
Some of the cases you gave were most likely a case for the publishers who took full benefit of the name of the originator. Eventually, this is still reasonable as long as they allow the initial writer to be correctly assigned.