MoH volume considerably higher than IVR volme

I created some on-hold messages that is embedded into my MoH wav files. My IVR announcement’s were also created with same audio editor and volume level is the same on the PC. However, once I upload it, all the MoH audio is nice and loud. But the IVR audio seems very low.

I even put a copy of the same on-hold message as an IVR and the IVR volume is much lower.

Any ideas why this is happening?