Video link: https://www.youtube.com/watch?v=SL-HNjYQBvA
I am not claiming that this situation is a bug, as much as I would like to make attention to whether someone has the same effect of incorrect implementation of the sound.
When you improve Gazlowe's ultimate, the sound of his blows is muffled and the sound (noise) of saws is added. From the point of view of transferring the effect of choosing a talent, the player understands for sure that something has changed, but whether this effect is successful? The feeling that the hero really does damage, on the contrary, leaves, as the sound becomes quieter and only some background noise appears.
The sound on the video may not convey the whole situation, then you need to test it yourself (preferably with headphones).
The situation is roughly similar to Li-Ming, only there is a problem with too loud sound: https://www.reddit.com/r/heroesofthestorm/comments/hkz0x8/high_volume_sound_liming_talents/
