Player Stagger bar going up when not using Parry ability

I am playing Huntress, I have Spear + Small shield with Parry equipped.
Only sometimes even when I am not using Parry ability, I still get stagger meter up on my character when being hit... when I am using "Spear stab" or "Rapid Assault" or just walking around. Sadly usually resulting in me getting my stagger bar filled within half a second and dying to being knocked out.

I have it bound to Right click, I have been experimenting if it has to do something with Sprinting and using stab right from sprint for instance, or dodge rolling... but couldn't figure out the exact combination of actions that make my character do that.

Here is a video to the issue in game (please ignore the music)

Hopefully it gets found and resolved :/
Thank you GGG.