If you mean mirrors created by the CreateMirror command, that's because they are actually real objects. When you use builtin mirrors the engine duplicates the entire scene's geometry and flips it around. Because it's real geometry and the same render pass, the same lights apply to it. (i.e. yes it's a bug, but not one that can be easily fixed.)
Builtin mirrors have a lot of unintended behaviours and really shouldn't be used for anything other than the most simple scenes. In most circumstances you'd do better to use something like cubemapped reflections.
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