Gravity I2C 16x2 Arduino LCD with RGB Font Display (versiyon 1.1)

Hello, I connected the Gravity I2C 16x2 Arduino LCD with RGB Font Display (version 1.1) I purchased to the Arduino nano. While the first line of the screen is displayed normally, no matter what is printed on the second line, two different characters are added to the end of the characters. These characters are not known characters. I'm adding the photo at the end. Can you suggest a solution to this problem? Thank you.