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Maybe they didn't realise that it would explode?
Battlefield cleanup is a really hard thing to do properly, the cost of shipping a lot of the hardware home is probably higher than leaving it there. In addition its very hard to track every weapon in a country when you are not tracking your own weapons, the US leaving their own weapons there would be bad, leaving opponent's weapons is a lot harder to find. Things like mines when laid by a non-modern army are very hard to track - most don't follow patterns or maintain maps, modern armies tend to map their mines and follow patterns (though some of the techniques are truly ingenious in their positioning!) so are easier to remove.
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