FastQC per sequence gc one sharp peak and one broad

[FelipeDre]

I sequenced human data and my fastqc records fail in the "per sequence gc content" where a very sharp peak appears and a broad second. The sharp peak centres at 51%. Could this be contamination (since human gc content is expected at 42%)?

[AntonioRFranco]

It you access the help, you can read it can be attributed to many causes. Contamination of your samples can be one, but not the only