In the North America version, the names Poppi α and β are used for sure. The UK site has been updated yesterday and is directly based on the Japanese one, I took care with this names use that is why you did not see the change here. I do not know whether the UK version will have different names or it is an early names use, or anything else.
Yes, I know, it is really strange. And it is really weird to use α then QT. I will be able to check it soon, UK and Japanese versions as well, it should be Poppi and Poppi JK except a change has been made in the last moment. If they finally use Poppi α and Poppi QT, be sure the page will be corrected back.
I had a doubt, what I saw was probably still an early version, I think you are right, eventually they really change it to "QT," really weird. It is still strange they change for "QT" and keep "α"... I really wonder even suppose that they did a mistake and forgot to change back "Poppi α" to "Poppi" only as seen in the UK site and the Japanese version. I will be able to check soon but not today. But I think there is no doubt now, she is eventually "QT" in the final version.