3 valid documents rejected for my mother's GC petition

[rupomrupom]

3 of the documents that i have submitted were rejected where i want to know what did i do wrong.
1. My (Petitioner) Birth certificate: It said "Please replace this with an acceptable birth certificate from a correct issuing authority." . But i have used the same birth certificate for my H1b, Green card and then for my citizenship.

2. My father's death certificate: it says "Please replace this with an acceptable divorce, annulment, or death certificate from a correct issuing authority". I have attached the hospital's document where they have declared him dead. Is that require city corporation death certificate?
3. Police Certificate: it says "Part of this document is missing or is difficult to read. Please replace this with a scan that shows the complete text of the document. Please ensure all sides of every page are scanned and visible." I am not sure why it is not visible because i can see and read every point in that document and that was the only page police gave to my mother as part of the police report.

Do i need to send these as notarized?
Not sure what i am missing.
I thought this is not that difficult and did not work with a lawyer. Maybe i should contact a lawyer in Newyork?

[mnsweeps]

My mom born in 1948 doesn't have BC so we got a local municipality to provide the non availability certificate. I did not provide my fathers death certificate and no police certificate. Was that requested? I just applied for 485,AP,EAD 2 days back. I-131 was filed in Dec.