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Chemistry-please help

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I have a queestion on Gas Chromatography(GC).
The following were injected into the GC systemk: -

1) 1% sample solution in acetone
2) a 500 times dilution of item 1)

The retention time of the main peak in the diluted sample solution 2) shifted by ~ 2min.
The expected area count is also half of what is theoretically calculated. (i.e. I would expect the area count of the diluted solution to be 500 times less than the sample solution.)

Can you suggest possible reasons for this difference in retention time between the sample and the diluted sample?
Does this shift in retention time happen to some samples that are too diluted?

Thank you.

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