Hey there! Happy to try to help here. We find that this is very common for international applicants. Now remember, schools dont expect for international recommenders to have perfect native English. However, it is important that the letters be CLEAR. That is, if there are some errors that is just fine--but it is important that they be understandable in English to the adcom. We recommend that you try to get a copy of the letter. You dont need to even read it, but try to pass that letter off to an editor to make sure that it all makes sense. Once it has been cleaned up just a bit, you should be fine to submit the thing. Your recommender should be open to this--after all, they want you to succeed!