Why voltage sensors are reading these values
Your transistor is operating in saturation. Vbe is typically 0.6 or 0.7 volts, and Vce,sat is typically 200 mV.

So the the voltage across R1 is (5-Vbe) ~ 4.3 V.

The voltage across R2 is (5-Vcesat) ~ 4.8 V.