Bad symbols in the serial monitor when connected via USB 3.0

I tested DHT11 + Arduino Uno with a very basic example sketch. The Arduino board was connected to USB 3.0 and sometimes I saw incorrect symbols in the serial monitor, e. g. "Humidit?: _7%" instead of "Humidity: 37%". This strange effect disappears when I connected the board to USB 2.0. Baudrate in code was always same as baudrate in the terminal settings.

When I increase baudrate I see less bad symbols but they not disappear while Arduino connected to USB 3.0.

The OS is Ubuntu 20, this was the first time I connect the board to USB 3.0. Is this behavior normal?

The sketch:

/**
 * DHT11 Sensor Reader
 * This sketch reads temperature and humidity data from the DHT11 sensor and prints the values to the serial port.
 * It also handles potential error states that might occur during reading.
 *
 * Author: Dhruba Saha
 * Version: 2.1.0
 * License: MIT
 */

// Include the DHT11 library for interfacing with the sensor.
#include <DHT11.h>

// Create an instance of the DHT11 class.
// - For Arduino: Connect the sensor to Digital I/O Pin 2.
// - For ESP32: Connect the sensor to pin GPIO2 or P2.
// - For ESP8266: Connect the sensor to GPIO2 or D4.
DHT11 dht11(4);

void setup() {
  // Initialize serial communication to allow debugging and data readout.
  // Using a baud rate of 9600 bps.
  Serial.begin(9600);

  // Uncomment the line below to set a custom delay between sensor readings (in milliseconds).
  // dht11.setDelay(1500); // Set this to the desired delay. Default is 500ms.
}

void loop() {
  int temperature = 0;
  int humidity = 0;

  // Attempt to read the temperature and humidity values from the DHT11 sensor.
  int result = dht11.readTemperatureHumidity(temperature, humidity);

  // Check the results of the readings.
  // If the reading is successful, print the temperature and humidity values.
  // If there are errors, print the appropriate error messages.
  if (result == 0) {
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.print(" °C\tHumidity: ");
    Serial.print(humidity);
    Serial.println(" %");
  } else {
    // Print error message based on the error code.
    Serial.println(DHT11::getErrorString(result));
  }
}