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Read what NPV computes
The NPV equation discounts each dated amount using a stated rate and adds the present values. That calculation can be performed without specifying a bank account or a transaction in which every receipt is subsequently reinvested.
Define a different terminal-wealth question
If a study asks how much wealth exists at the final date after reinvesting interim receipts, then the reinvestment rate and availability are additional assumptions. The resulting accumulation calculation is a different question from simply solving the NPV equation.
Check a ranking conflict from the schedule itself
Differences in scale or timing can create distinct IRR and NPV ranks. Inspect the values and rate-dependent profile rather than explaining every conflict with an unobserved reinvestment transaction. The scale example below uses one future receipt, making the distinction especially clear.
Keep the narrative tied to defined inputs
State whether the report values cash flows today, solves for a root or models final-date accumulated wealth. Do not turn one calculation into evidence about actual interim investment returns that were never modeled.