The base bet was 1.8 and you won 2,133 means that the multiplier is around 1185x. It is a nice multiplier in this game and you got the best payout in the last spin of the free spins. Even though you got no wild multiplier in the 4rd row, but you get a good linked single symbol (highest paying symbol) to the last row. Imagine if there are at least 1-2 wild multiplier in the 4th row, the final result must be more than 2,000x multiplier.