I find that I am having a different personality in each (3) languages I speak, especially in context in a different country. When I switch back to my original language to speak to someone in said country my habits I do in my original country come back for the part and then I revert back. Feels a bit schizophrenic, but I think it is normal for most people. My child is showing similar patterns.

To me this is proof that learning a language touches a lot of parts in our brain, not just affect the parts about learning