Please see How to add images to a Biostars post to add your images properly. You need the direct link to the image, not the link to the webpage that has the image embedded (which is what you have used here)
You only have three male control samples; I wouldn't be that quick to throw one of them away. Maybe your controls really do have that much variation.
Can you see an obvious QC reason why those samples are like they are? Markedly lower % of mapped reads, markedly lower RIN score, anything like that? I'd ask the people who did the library prep if they noticed anything about those samples.
Please see How to add images to a Biostars post to add your images properly. You need the direct link to the image, not the link to the webpage that has the image embedded (which is what you have used here)