Burning retrograde increasing periapsis?

[Person012345]

I was wondering how this is possible. I was coming back from minmus and noticed that burning retrograde ended up increasing my periapsis on return. I've done similar maneuvers before and it's never behaved like that. I was wondering how this is actually possible (I don't understand how slowing down made my periapsis rise - it seems counter-intuitive). Here is a short timelapse so you can have a look at the situation:

http://puu.sh/3MNoC

http://puu.sh/3MNoO

http://puu.sh/3MNp2

http://puu.sh/3MNpe

Basically I'm wondering about the physics here (I thought that slowing down should always cause you to miss the gravity source less).

[NovaSilisko]

Wrong navball mode

Click the velocity to change it

[Person012345]

Wrong navball mode

Click the velocity to change it

Ah, ok, that's odd, does it not change automatically any more?

[NovaSilisko]

It does, you must have clicked it without noticing.

[RexKramer]

Here is another possibility. If you dock two vehicles together, it is possible one is now 'upside down' from how it looked during launch. If you are controlling the vessel from the 'upside down' module, like a lander', but the active engine is the main ship engine, then when you add thrust it will be thrusting backwards.

If that is the case, you can correct it by right clicking on the command module of the stage with your main engine, and select 'control from here'.