Atypical Chromatogram

Hello, we have observed a couple of atypical chromatograms in the same run.  In a run sample injections, the 11th and 13th injection were observed to be atypical.   We have looked into the parameters of each injection and they are within our method specifications, also the pressure has been constant throughout the sample injection.  Any advise or next steps to figure out what is happening would be really helpful.

Thank you all! :-)

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