Kerbal Space Program

I found a bug while playing on the latest version 1.9.1. I catch the asteroid with mass 3,7 tons, in the tab of stages it writes 162.8 tons and delta v becomes very small. I check this on three different asteroids a,b and c class, and there is problem with them too. In version 1.7.3 there are no this bug. Look at screenshots. Also, i added a save file with sandbox from 1.9.1 version, where I catch a-class asteroid to check if this a problem with my career. In this file mass of asteroid 4.12 tons, mass of spacecraft 12.8 tons, but it shows 162.8 tons with asteroid. Look at "Dawn NP" spacecraft.