LSF0108: Vref_A and Vref_B about LSF0108

Part Number: LSF0108

Our actual application scenario is shown in the figure below, using a single power supply:

VCCB is connected to 5V, with R1 and R2 having resistance values of 1MΩ and 555KΩ respectively.

When we actually measured the voltages at Vref_A and Vref_B, the readings were 3.06V and 4.1V. However, based on theoretical analysis, the expected voltages at these two nodes should be 3.3V and 5V.

Could you please explain what might be causing the discrepancy between the theoretical analysis and the actuPicture.JPGal measurements?