I am currently writing my biology report for an experiment I did on how ethanol and detergent affect the cell membrane. For my ethanol experiment, all went as expected. However, for my detergent experiment, the results seemed quite strange. The absorbency rate was higher for the 20% and 40% detergent than it was for the 100%. It seemed as though the results were backwards. I'm really confused. 

What might have happened? Was it just an experimental error or is there a reason behind this? Can you also please explain to me what detergent does to a cell membrane exactly?