when I click on another track, Prophet's settings are messed up. HELP ME !!!!!

[dayrick]

Hello I am using Prophet rev2 8 voice model

My DAW is Ableton live 10 and I am using Mac osx Mojave.

I'm not good at playing, so I'm trying to send a Midi signal to the Prophet rev2 using the Ableton External Instrument.

There is one problem here, when I click on another track, Prophet's settings are messed up.

Are there any countermeasures for this? Is my device broken?

Thank you for your reply