I speak four languages and I stutter in all of them. Although, I’d have to say that I stutter the most in my mother tongue which is Polish, and the least in English. The speech fluency varies and it’s not a set-in-stone kinda thing. As you said yourself, it’s probably due to lack of practice. To be completely frank with you, I no longer care about my stutter. This year has been so tough, like university-wise, I just stopped caring whether I stutter or not. I just let it happen and if someone gets uncomfortable because of me stuttering in front of them, I just let them sit in their uncomfortableness and I go on with my day.