Two different delta-v readouts?

[Rayquaza]

As shown in the screenshot,


KER reads out two readings for stage 3 - 1697m/s, and 5196m/s. Why are those two different? And why are the ones below it the same?

[Red Iron Crown]

Welcome aboard!

The right hand value is a running total, the left one is for that individual stage. So you have a first stage (S4) with 3499m/s, and a second stage (S3) with 1697m/s. Parts in the second stage will have been accelerated by the first, so total dV is 3499 + 1697 = 5196m/s.