Possible issue with burning damage

I have been playing an FO/Hydra build, and noticed that monster health bars are not showing any signs of having a DOT (burning) effect. I checked to make sure that i had selected Roaring Hydra but it does nto seem to be applying burn.

I thought maybe the damage is so small that im just not seeing the DOT segment on health bars, so i swapped out hydra for firewall. Even with firewall i can endlessly spam firewall on a monster and the health bar never shows any sign of having a DOT applied

If burning is not being applied it would also make a lot of sense why this build feels so incredibly weak because a lot of its damage comes from Fundamental Release/Flamefeeder/burning instinct

Video showing several monsters standing in firewall with no sign of taking damage from it or having a DOT effect applied

https://youtu.be/EEbX__td-Aw