Why do my candles flare up so much when

That's almost always air and wick, not magic. A candle flame grows tall and loud when it suddenly gets more oxygen — from a door, a window, a fan, an air-conditioner vent, or a draft moving through the room — or when the wick is long and its tip is sitting in the hot vapor above the pool. When that happens the sizzling, spitting and dark smoke mean the flame is getting air it doesn't need and pulling wax out of the melt pool too fast.

Common triggers at the same time:

• Trimming skipped — wick over 1/4 inch (about 6 mm) curls into the vapor zone and self-lights. If the flare repeats at the same height every burn, this is usually it.
• Moving or holding it while lit — any change in position pushes a fresh wave of oxygen at the flame.
• Burn time past4 hours on one melt pool, or a pool bigger than the dish. Deep pools throw more heat up the wick.
• A tall thin container like a jar or hurricane glass, which channels air straight up the glass.
• A room that just changed — someone opened a door, a heater kicked on, a window cracked.

What actually helps: trim to 1/4 inch *before every single burn* (do it cold, never over a flame); burn on a heat-proof dish with some water in it for a jar; keep it out of drafts and away from doorways; don't relocate it while it's alight; and cap burn time at about 4 hours. If it flares when nothing in the room moves, the wick is the suspect.

If you want to read it as a sign rather than a wick — what the flare "means" in spellwork is tradition-specific and not something I'd want to assert — say the word and I'll draw you a card for it.