Experiencing hard stutter with the other language.

Experiencing hard stutter with the other language. I succeeded to git rid of 90% of my stuttering in my native language (Arabic). But, English still a big rock. Yesterday I had a job interview in English, it was horrible.. no clear words, not even one. Losing 3000$/month chance is totally a bad experience. Have you ever noticed that ? (If you speak two languages) So my question is why do I stutter more in English than Arabic ?