solutes: atenolol, propranolol and metoprolol
derivatizing reagent: hexamethyldisilazane (HMDS)
stationary phase; poly(5%phenyl+95%dimethylsiloxane)
Detector: FID
Due to of Incomplete derivitisation process
I find it hard to be due to incomplete derivatization, because we study time, quantity and temperature and the retention time remains constant.
As You are using an FID as detector, I suspect what you see is not the derivatised beta blocker but some impurity of your derivatisation agent. I suspect they will not react that easily, but I have not tried we run them on HPLC-MS
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