This past weekend (11/7-8/24), CPFCU finally fixed an issue in their QFX file downloads where the contents of the ACCTID field did not uniquely identify the account that was being downloaded. CPFCU uses a two part account number. A 6 digit member number and a 4 digit account type identifier. The four part portion differentiates the multiple accounts a member might have (0000 for 1st share, 0080 for 1st draft).
To properly identify an account, both parts were needed. CPFCU was only putting half of that information in the ACCTID field, so Quicken would try to stick all of the information into a single account unless the user edited the file and changed the ACCTID.
Over the weekend they updated the software to include both the 6 & 4 digit numbers in the ACCTID field and everything works as it should.
A Quicken user will need to re-link their accounts, but that will be a one time occurrence.