Excel Time Subtraction Troubleshoot

I am struggling with incorrect results when attempting to subtract two values in a column of clock times in Excel. My data is in a 12-hour clock format, and I signify AM and PM directly within the time cells. I require an expert in Excel to address this issue promptly. To take on this project successfully, you should have:

- Proficient Excel skills
- Solid understanding of the 12-hour time format and functions in Excel
- Ability to troubleshoot and rectify the problem quickly