Spacialized sound fully attenuated when player perpendicular to the source

Hi,
I’m working on spacialized sounds and while it does work properly on most circumstances, I have noticed a particular case where it doesn’t:

Indeed, when the player is perpendicular to the sound source, its volume is fully attenuated (the sound cue can barely be heard).
I guess, this problem has something to do with my sound cue’s attenuation settings. But I can’t find what’s wrong with it :

Any help would be greatly appreciated!

Little bump. Noone else got this issue with spacialized sound cue?