Recommended mean you will definitely make the list. It might be first or second list but certainly your admission is guaranteed.
Not recommended means you didnt meet the cut-off marks set for your department, it does not mean you will not make the list but your chances are quite slim.
Most people that were not recommended last year still end up making the second list and even very few made the first list.
your departmental cut off is not set yet. not yet certain weather you are recommended or not recommended. For this category I will advise you keep checking the portal until you see recommended or not recommended.
Issues with your credentials/application and my advice is visit your department and clarify as soon as possible.
This means you aren’t qualified for the course you applied for. You may need to visit the department to ascertain what the actual problem is if this be your case.