I am using Agilent 7890a GC with an FID detector. Last week I saw that there are few ghost peaks in my chromatogram, so I decided to bakeout the column. After baking the ghost peaks disappeared but now I see and increase in the peak towards the end of the run (please refer to the attached picture). I cleaned the liner, even put a new one and also trimmed the column a little bit. Problem still persists.
Do you have any idea why this is happening and what would be the solution?