I've been having trouble with hplip + sane when scanning stuff. After scanning a page it will automatically feed the next one through the ADF.
The solution, which probably breaks a lot of stuff that I never use / I don't care about is to edit scan/sane/hpaio.c Function hpaioAdvanceDocument Just below the opening bracket, add if ( hpaio->alreadyPreAdvancedDocument == 1 ) return SANE_STATUS_GOOD; Now, whose fault the double page is I don't know, but it fixed the problem for me anyways.
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