Read out SDA1 and SCL1 on Teensy 3.2

Hello, I'm currently using the Teensy 3.2 and want to read out the values of a sensor on the second bus. So via the pins SDA1 and SCL1. For this I add the second bus in the code via Wire1. However, when outputting the readings, I noticed that the readings from Sensor 2 over the first bus were exactly the same as the readings from Sensor 3 over the second bus.
What can this be, or can someone help me solve the problem and tell me how to read out the second bus at Teensy?
Thanks!