Props? Incorrect crew credits being added

I have noticed this oddity before but only today spent the time to investigate:
Many credits for 'Props' s/b something else, i.e., credits are wrongly being added as 'Props' and not being changed/updated.
e.g., most recently; (unknown how many similar entries exist in our db, I'm guessing directors, editors, cinematographers, actors, with prop crew credits bear re-inspecting)
?????
The Flying Killer (1967)
Props
Liu Chia-Liang
Tong Gai
http://hkmdb.com/db/movies/view.mhtml?i ... ay_set=eng
??
Lee Song
Props (1 film)
You'd Better be Smart (1965)
http://hkmdb.com/db/people/view.mhtml?i ... ay_set=eng
???
Lee Pak-Chiu
Props (1 film)
Street Corners (1964)
http://hkmdb.com/db/people/view.mhtml?i ... ay_set=eng
Many credits for 'Props' s/b something else, i.e., credits are wrongly being added as 'Props' and not being changed/updated.
e.g., most recently; (unknown how many similar entries exist in our db, I'm guessing directors, editors, cinematographers, actors, with prop crew credits bear re-inspecting)
?????
The Flying Killer (1967)
Props
Liu Chia-Liang
Tong Gai
http://hkmdb.com/db/movies/view.mhtml?i ... ay_set=eng
??
Lee Song
Props (1 film)
You'd Better be Smart (1965)
http://hkmdb.com/db/people/view.mhtml?i ... ay_set=eng
???
Lee Pak-Chiu
Props (1 film)
Street Corners (1964)
http://hkmdb.com/db/people/view.mhtml?i ... ay_set=eng