The phrase "grammatical issues" refers to mistakes or problems with grammar, which is the way words are arranged in a sentence and how they are used correctly.
Sentences with «grammatical issues»
The entire gaming experience, other than a few minor grammatical issues in conversations with NPCs and the necessary huge patch downloads, was as close to flawless as I've seen. (metacritic.com)
As readers, we don't need perfection and I don't suggest we quibble over obscure grammatical issues, but you do need a decent proof reader before you publish — it will increase the clarity and accessibility of your arguments. (supernutritionacademy.com)
I was open to suggestion during the editing process, as far as grammatical issues and expanding on some of the ideas I presented in the «non-CaringBridge» portion of the book. (blog.balboapress.com)