Duplicate inline styles?

[TheOddler]

I have a list of elements, each with the same style. And it seems the style is generated once for each, but they get the same class-name, and are applied to all elements:

So the element has the style ._21e74195 applied to it multiple times.

This means, that if I uncheck one of the rules, the next iteration of it takes over, which makes debugging the css very annoying. For example, in the next picture I disabled the margin on the first iteration, but then it just takes the same margin from the next one.

Is this a bug? Or am I doing something wrong?