This is on Windows, Quicken R64.35
I have some Fidelity Investments accounts that have their cash position in the FDIC Sweep program (QIWSC) and when Fidelity records monthly interest it also has a line that says Reinvested (since this is the account's core position). In Fidelity, the Interest line increases the cash balance, and the "reinvested" line does not change cash. However, when Quicken downloads these, it records one transaction as "reinvested interest" and makes no change to the cash balance. Then when done accepting downloaded transactions, Quick pops up a "Verify Cash Balance" window; when the cash balance is verified, Quicken adds its on Xin transaction to increase the cash balance.
The corrective action on my end is to change the "reinvested interest" transaction in Quicken to a simple "Interest" (which increases cash) and remove the Quicken-added Xin for the same amount.
See in the above that the "Interest earned" line increases cash, and the "reinvestment" line makes no change - this is from Fidelity. Quicken changed that pair into one that makes no change in cash.