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A call option's premium depends on much more than just the stock's direction. Here's why your call option can fall even when the stock is rising:

1. IV Crush: The most common reason. After a results or news event, implied volatility collapses — the Vega loss on your call option premium easily outweighs the Delta gain from the price rise.

2. Theta Decay: If the move is slow or small, time decay erodes the premium faster than the stock's rise adds to it.

3. Low Delta: A deep OTM strike barely reacts to price moves. A ₹20 rise in stock might add only ₹1–2 to the call option premium.

4. Strike-Specific Selling: Heavy call writing at a particular strike floods supply, crushing that strike's premium regardless of spot movement.

5. OI Migration: As the stock moves up, traders rotate to higher strikes — demand at your strike drops and softens its price.

6. Stale LTP: In illiquid F&O options, the last traded price may not reflect fair value. Always check the bid-ask spread, not just LTP.

Bottom line: The stock price reflects what has happened. The option price reflects what the market thinks can still happen. When future uncertainty drops, your call falls — even if the stock is up.