Thanks for posting! There are several factors that can affect your score. It is possible for the iOS to affect performance, so if you have updated your iOS since, that could have something to do with it. It also depends on whether there were other processes running in the background at the time the benchmark was run, or whether or not your iPhone was in low power mode (this can cause lower than normal scores).
It is also normal for scores to fluctuate slightly each time you run the benchmark. If it is a significant difference and you are concerned, feel free to send along both results and we can take a closer look.