Which of the following is NOT a symptom of formatting issues?

The choice indicating "Unexpected credentials alert" is correct because it pertains to security or authentication problems rather than formatting issues. Formatting issues typically relate to how data is presented or structured. Symptoms of formatting issues can manifest in various ways, such as truncated data, where the information is cut off, making it incomplete or unreadable. Incorrect line endings can occur when data is transferred between systems with different operating systems, causing improper display or processing of the data. Improper character escaping is related to how special characters are treated within data strings, potentially leading to rendering errors or operational failures.

In contrast, unexpected credentials alerts arise in scenarios involving authentication failures or security breaches and do not directly stem from how data is formatted or presented. Therefore, it correctly stands apart from the other symptoms associated with formatting issues.