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Electricity A-level physics

So there was a question on how the position of the voltmeter changes so it's parallel to a different resistor in the circuit and it says: The voltmeter is now connected across the 640 Ω resistor as shown in Figure 2.
The reading on the voltmeter is 2.10 V.
When the voltmeter was connected across the 320 Ω resistor, as shown in Figure 1, the
reading on the voltmeter was 1.05 V.
Explain why the sum of these voltmeter readings does not equal the emf of the battery.

I'm not sure why they don't equal and I don't really understand the markscheme as it says the current changes because the resistance changes but why would the resistance change?

Thank you!!

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