Upon reviewing the dataset for abnormal entries as per the given hint, the following issue has been found:

{
    “issue”: “Abnormal entries in 'thal' column”, 
    “evidence”: ”0      7\nName: thal, dtype: int64”, 
    “description”: “The 'thal' column, which represents the thalassemia blood disorder, typically should have values between 1 and 3 for normal, fixed defect, and reversible defect respectively. However, there are 7 entries with a value of 0, which doesn't fall within the expected range and could indicate missing or incorrectly entered data.”
},