Arduino with Bluetooth problem

[sharckas]

@groundFungus

#include <SoftwareSerial.h>
SoftwareSerial BTserial(4, 7); // pin 4 to BT TX, pin 7 to BT RX
                               //  through voltage divider

void setup()
{
   Serial.begin(9600);
   Serial.println("Bluetooth test program");
   BTserial.begin(9600);
   BTserial.println("Bluetooth test program");
}

void loop()
{
   if (Serial.available())
   {
      BTserial.write(Serial.read());
   }
   if (BTserial.available())
   {
      Serial.write(BTserial.read());
   }
}

I tried this code and the monitor is returning this:

every "⸮" is supposed to be a character