Reduced sensitivity with MeOH as a solvent

I am running terpenes on an HP-6890 with an autosampler and an FID, injecting 1 ul using 10:1 split with hydrogen as a carrier gas.  I observed that when my standards are dissolved in MeOH the response of all peaks is about 1/4 of that in Heptane.  What could be the reason for that?

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