Front Injector/Detector Not Giving Results

In the middle of a sequence I ran, the front injector/detector stopped producing peaks, and those samples don't show up in my report. When I run the same samples through the back injector, I get peaks. I assumed it was maybe a mechanical issue, but the samples ran through the front injector are producing solvent (Hexane) peaks, but no sample peaks. I've never ran into this problem after a few months running the machine. I'm running a GC8890 with OpenLabCDS 2.5

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