Center of mass of rocket moving

[Adjie]

I just built a symmetrical rocket. The rocket's center of mass(as you guessed it) is approximately in the center. The fuel tanks are all full. But when I launched it...

Well, the rocket's center of mass moved. One of the fuel tanks(2x symmetry) is heavier and more loaded than the opposite side of the same tank.

At that point I thought I didn't place the fuel lines(or pumps or whatever) symmetrically(I did use asparagus staging, by the way). I reverted to the VAB and... that's not it. I placed it symmetrically and put it in the right place.

If you can duplicate the problem and fix it, here are the mods + craft file:

Mods:

Module Manager

Making History Expansion for KSP 1.5.1

KSP 1.5.1 (just so you know the version)

TimeControl

ToolbarControl

NearFutureElectrical

Kerbal Alarm Clock

Landing Height

BDArmory

Click Through Blocker

Community Resource Pack

Dynamic Battery Storage

B9Part Switch

KER

VesselMover

Craft File:

https://drive.google.com/open?id=1E-OocxItx_A1VJ4bByiNSV9zKhIpEuX3

Edited January 2, 2019 by Adjie
Adding Craft File

[Xd the great]

Seems like uneven draining from the fuel tank. Probably flow priority is wrong.

[Superfluous J]

Any chance you do anything like routing fuel into those 2 tanks from one tank, and then into 1 tank from those 2 tanks? That's been an issue for quite some time and the only fix I know of - outside of using a fuel balancing mod like GPO - is to not do it.