Weapons flip when upside down shortly when you click on them

[lectrician1]

Recently I encountered a bug where a weapon was placed in the building area upside down. Here is the screenshot:

At first, I thought this was a simple mistake but I went in a bit further a realized that every time you simply click on any weapon in the build menu, it flips upside-down and then back upright with a short delay. I have only seen this happen with weapons. Here is a short clip of the bug in action:
http://gph.is/2I45QMd

I simply clicked the weapon, and as you can see, the weapon outline behind the weapon in the menu briefly shows the weapon upside down. I suspect this is what causes the weapon to be placed upside down on the build area in the first place.

At the time of doing this, my laptop was a bit laggy and after I closed a few windows, the glitch time between upside-down and upright was shortened to the point in which you couldn't tell.
This bug does not occur on any of the other game elements (as I have tested).