The phrase "grammar issues" refers to mistakes or problems related to the rules and structures of a language. It means that there are errors or issues in the way someone uses words, sentence structure, or punctuation. Full definition
Besides that and other incorrect facts, you have a ridiculous number of spelling and grammar issues in your article. (goodereader.com)
Remember that practice makes perfect and can also help you weed out problem grammar issues from your interview vocabulary, increasing your chances at getting that call back or job offer. (blog.simplyhired.com)
Do either of you do «Ask the Editor» for grammar issues? (thebookdesigner.com)