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I don't know what to do with these extra pins and I have tried to delete them but it says "CAN'T DELETE BUS BIT". Those are some sort of replica of the pin in design, even though their I/O Standard is not set to differential . it can be seen at last in image above.
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Hi,
Can you please check with quartus setting file *.qsf?
It can overwrite the previous assignments.
Please refer the "7.2.1.4.1. Adding Pins and DQ Group Assignments" from the link below,
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/external-memory/emi_plan.pdf
Regards,
Vicky

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