This feels either like a bug or an incomplete feature. 

I have several fences on main desktop, which happens to be an external monitor. Most of the fences are set to sort alphabetically but two have a specific icon order I've specified. Upon startup, or whenver I disconnect the second monitor, the icons in the those to fences randomize their order. For layout auto-adjustments, I have selected "Store my layout on a per-monitor-configuration basis" but even after reordering icons regardless of which monitor the fence is on at the time, these two specific fences STILL randomize icon order. 

What's going on here and how do I get it to stop?

-S