Engr or Eng, what's right??!!

I was assigned to handle the printing materials for whole company, so regularly I am receiving loads of request for printing specially business cards and much to my surprise most of these request requires their titles to be clearly mentioned without any 

Interference on my side

On one or two occassion, I tried to correct the ENG to ENGR as I know , that is the standard which stands for Engineer, it always comes back to me with a big remarks on the proofing that ENGR is not even a word in kuwait, I was like... who the hell started this!!??!!

or maybe I'm wrong, but needless to say, ENG stands for ENGLISH or ELECTRONIC, and ENGR is the proper abbrevation for Engineer as per wikipedia,

but it is more confusing when I found this site:

well, I guess, we are all RIGHT in our own terms but of different page,
it's not my business card so I have to mind my own business then!! ..... heheheh