Many many personality tests are pure junk. Of if they have any value at all that value is rarely gleaned from some HR person reviewing and interpreting the results. They might as well as you what astronomical sign you are.
I had to take a personality test once as part of an interview process. The test had insane questions which asked for level of agreement/disagreement, such as, "I am usually comfortable on the edge of a ledge." I'm serious, that was one of the questions.
There were other questions like that, which made me feel like they were going to issue me a high-powered rifle and a copy of the President's schedule. I had to double check that the company I had applied to was not called "Parallax".
After a great deal of delay, they offered me the job and a very nice salary. I declined and told them the test was the reason.