I have good variety in my recent hatches, but I once had a 4 streak of pineco.
But at least you can evolve that for exp so I could have been worse. :p
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One batch of four gave me 2 Larvitar and two pinecones.
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For some reason, recently I've also experienced streaks of the same 10k hatches pretty often.
A few weeks ago I got 4 Pineco in a row, then I got two 100% IV (!) Gligar hatching at the same time, and just a few days ago I hatched two Larvitar (very rare for me) at the same time.
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4 Elekid in a row.
From 10km eggs...3 Chansey in a row.
Last week I got back to back Larvitar.
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3x pineco I feel you buddy T-T
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I got 4 scythers in a row back then when the 10km pool was quite big.
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Not quite four in a row, but I hatched Dratini, Dratini, Dratini, Lapras, Dratini in the middle of a batch of eight 10k eggs Wednesday. Also, the first two were both Larvitar, and I think the last 10k I hatched weeks ago might have also been Larvitar, so that would be three in a row there too.