Hi Bella.
All baddies are not the same. A 30-day late is a minor derog, while 90-day+ lates and COs and CAs are majors. They score very differently. So, as has been stated, it is both the severity of the derog and the passage of time since the derog that controls FICO scoring.
As for the discrepacncy in the number of derogs reported at the separate CRAs, it could either be because your creditor reports to only one or two of the CRAs, or because the OC or the CRAs have reporting errors. I would suggest that you contact your OC and ask them who they report to.
Inconsistencies in reporting the type and severity of derogs are common Credit reporting by a creditor requires them to record and transmit an intricate set of codes, and one consumer action can affect a multiplicity of recording codes that may not each be improperly coded by John or Jane Doe data transscriber at the OC.