Two Creeps on same tile
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It seems that when a creep is moving to the tile above a spawn, and in the same tick the spawn finishes spawning, both creeps end up on the same tile.
This can be observed here:
Tick before: https://screeps.com/a/#!/history/E12S57?t=13468029
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As far as I know, this is intended, I vaguely recall that I've filed this as bug before, and it was rejected.
I had to write code to deal with this myself some time ago.
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The same happens if an invader sits on an exit tile, and your creep enters the same tile from another room.
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This has been fixed in the today's patch.