Can someone explain this Bug

[gilflo]

I launched 5 probes together on a 17000kms orbit to Jool (Image 1) . I separated  a probe with an LFO tank 90/1000. (image 2). On KER I read more 4000DV  and I get them! The same probe in the VAB: Mechjeb and Ker give 1938 VAC DV around Cool (image 3) . I teleport this probe with Kerbaltek on the same Jool orbit -17000 kms- and I got the 1938 DV expected (image 4)

https://imgur.com/IZ1TiFj

https://imgur.com/md0YAJB

https://imgur.com/GAHwkOM

https://imgur.com/odyyC8Z

 

[Gargamel]

Moved to tech support modded 

[jimmymcgoochie]

Here's what I think is happening:

• I can't really see much of the vessel in image 1 but I'm going to assume that each probe is attached to the central craft by a radial decoupler attached to the fuel tank. Another screenshot with the ambient lighting settings turned up (a lot!) or the vessel in the VAB would help.
• When the probe is separated, the root part of this new vessel is either going to be the radial decoupler or the fuel tank it was attached to. In either case, this is below the stack decoupler under the probe core and so the delta-V readout assumes (wrongly) that you'll be decoupling that dead weight above the decoupler before firing the engine.
• When the probe is in the VAB on its own, the probe core is the root part and so the readout correctly displays the delta-V with the probe still attached.

If you right-click the probe core and then click "Control from here" after decoupling the probe, does that change the delta-V readout?