Your map lacks cubemaps, they make reflections work properly. What you're seeing is the default reflection of the HL2 sky when you don't build your own. Look up cubemaps and how to build them here: https://developer.valvesoftware.com/wiki/Cubemap
Of note: there's a special method for building cubemaps in TF2. It's also listed here, but do look for it.
Your map lacks cubemaps, they make reflections work properly. What you're seeing is the default reflection of the HL2 sky when you don't build your own. Look up cubemaps and how to build them here: https://developer.valvesoftware.com/wiki/Cubemap
Of note: there's a special method for building cubemaps in TF2. It's also listed here, but do look for it.
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