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The thing with trading stock options is, the liquidity is very low, so you may see that the LTP is something, but the bids and offers may be quite far from the LTP. As such, your SL may get triggered. The order matching bit happens completely on the exchange platform, by the way, so as long as the price isn’t available there, there’s no way your trade would be executed. This is quite a common query for us, actually. Check out this post: https://tradingqna.com/t/my-sl-in-a-trade-was-hit-but-i-am-not-able-to-see-the-price-on-the-charts/9368
The exchange also has a trade verification module where you can verify trades within 5 days of execution.