Processes run under WSL show up with a capital starting letter in the "Processes" tab in the Windows task manager - so for example "Cmake" instead of "cmake", but it applies to all processes I've seen. See the screenshot.
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Your Windows build number: Microsoft Windows [Version 10.0.16299.402]
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What you're doing and what's happening: 
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What's wrong / what should be happening instead: Task manager should show the correct process name, which is lowercase (e.g. cmake)