Vargha and delaney effect size

I performed vargha effect size on two samples, A and B. The algorithm A has better performance than B, but still when I perform the effects size in R, the value I get is 1.187 (large). What does this value mean? Does it mean, Algorithm B performed better? In the experiment, where these two algorithms are compared, A performed better than B, but isn't the result of effects size strange?