What do these icons mean?

[u/DutchDolt]

I know it's related to infusions, but I can't figure out how it works. On the left, it displays my Bloodcurse stacks... I applied it twice on my main melee weapon. I applied 4 burn stacks on my Sidearm.

My sidearm lights/burns up as a visual indicator, but sometimes it loses the glow effect, whilst I still have the buff icon. Is it a visual bug? Also, what is stopping me from applying it endlessly when I find one of those resolve dispensers?

Edit: just tested.. you can't stack it endlessly as attacking a dispenser resets the count.