GC-MS Baseline Increase

I am using GC-MS and Ultra Inert Liners, 5190-2295 for Pyrethroid pesticides.

Problem: The baseline has a normal section and an increased section during the sample analysis process. The increased section obscures Cypermethrin peak and Cyfluthrin peak (I care a lot about these two substances)

This increase or decrease does not depend on the oven program.

Please give me some advice to improve the problem

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