Buff icons flickering

[pugna]

Some buff icons in the bottom left are constantly flickering.
It's inconsistent between different icons, happens for:

• Hollow Point Ward
• Enchanter's Barrier
• Divine Barrier
• Colossus
• Ethereal Shift
• Spirit Strike
• Quicksilver Reload
• Surge of Power
• Diviner's Kevlar
• Heroic Aura
• Spiritual Overflow
• Metal Skin

but doesn't for:

• Combat Barrier
• Burst Fire