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I updated the tags on your post for better visibility and moved it to an applications area.
A few things:
- Your internal standard and toluene elute very close to each other, make sure the integration is correct.
- Ethylbenzene and m/p-Xylene elute very close to each other, make sure the integration is correct.
- Try making a fresh solution of your internal standard. This could be the problem, we have had this issue in the past.