the glide does not work in the ATR 72 Carenado

Hello,

During my flights I am in RNAV mode.
When I'm in the final, I switch to V / L mode to capture the LOC.
At this moment the ATR captures and follows well the LOC, but not the GLIDE.
In fact he captures the GLIDE but he does not follow it for the descent.

Do you have a solution to this problem?

Thank you for your answers,
Regards,
Hervé31.