Bigcommerce stencil inconsistent CSS styles between development and production - bigcommerce

Question

Is Bigcommerce performing some sort of minification to the main theme.css stylesheet being generated in production? I'm seeing a strange issue where certain styles that work correctly in development do appear in production.
Here's an example. In my development store, you can see the new customer sign-up box here:
As you can see on the right, I'm showing the styles that are being applied to the ul element, which ensures there is a left margin of 1.25rem.
Now, after bundling the theme with stencil bundle and uploading it to my development store, this is what I see:
As you can see, the ul element no longer has it's margin-left applied. On the right, you can see that the styles being applied are not the same as they were in production. Specifically, the margin-left: 1.25rem rule is being overriden by the margin: 0 rule.
It's as if some process was run to combine style declarations for certain elements, but this caused the order of the rules to change. Does anyone know what is happening here? Or what process is being used to attempt to minify this css? Maybe it's a bug with the library doing the minification.
UPDATE
Here's another example of the issue that I just came across. I have a style declared to show a magnify glass when the user hovers over the main image to indicate that they can zoom. The style is defined as follows:
.zoomImg {
cursor: -webkit-zoom-in;
cursor: -moz-zoom-in;
}
As you can see, in development, this style appears correctly for .zoomImg:
However, in production the style is incorrect. The chrome prefixed declaration is missing:
Where did it go? I'm confused why the styles are being changed. Again, I'm assuming it's part of some minification process. Any ideas?