AltGr combination with AZERTY and QWERTZ layouts

Hello!
I have an issue with the AltGr key while using QWERTZ or AZERTY keyboard layouts:

AZERTY : when I try to write a backtick or a tilde it outputs the number instead
AltGr+7 (2 times) = 7 instead of `` (double backtick)
AltGr+2 (2 times) = 2 instead of ~~ (double tilde)
If I do AltGr+7 one time then type space, it outputs a backtick as expected.

Same for QWERTZ :
Backtick and tilde key combinations two times outputs Ý but one time + space outputs a backtick or a tilde