I had a limit buy order set to but a specific crypto (XRP) at a lower price. The order has now been filled but for some strange reason I can't see any trade history indicating that the crypto price went that low.
(....)
It will always show in your trading history for sure especially when the order is triggered or for example, you have to buy an order, when you saw a change of balance in your account means it was triggered.
Another thing is you should be aware that there is market order and limit order, maybe you misunderstood this part or did not know their difference.
See:
Market Order vs. Limit Order: What's the Difference?