Eevee evolution problem
I just evolved 8 eevee and expected a few Vaporeons. However, for all 8 evolutions, I got 4 Jolteons and 4 Flareons. It is really weird. I have used the name trick for Vaporeon for once and haven't used the name trick for Jolteon and Flareon. So is it just bad luck? Or my account got punished due to using the name trick on Vaporeon ?

Answers
Since I evolved 8 eevee and saw none Vaporeon, I even suspect they have lowered the chance on getting Vaporeon from eevee to less than 1/3. I just evolved one more, still got Jolteon. Maybe they do this for balance, or just my bad luck. Either way, I have to accept it. Okay, I will no longer expect Vaporeon from eevee, so I can escape from this annoying problem.
That's weird and it sucks. Vaporean seems to be the only one that's worth something in the game right now. I agree with xkilk, they should raise the amount of candies needed to evolve Eevee, but it's too late now for that. Everyone has multiples of all 3 Eeveelutions. Also, why is Eevee in a 10K egg when you can find one on every corner. She's on the sightings almost as much as Pidgey's & Rattattas.
Have you done the following?
Rename your eeveeloutions instead of keeping them the trick names (Pyro, Rainer and Sparky)
Signout of Pokemon Go
Restart your phone
Sign back in
Nickname your Eevee (s)
Evolve and enjoy!
This method works for me and my friends and although its anecdotal evidence it is worth trying out. If this method isn't true then my friends and I are just lucky. Although I doubt its luck since the results speak for themselves. .. I would like to see if it works for others...perhaps it has to do with cached info or data in the app...signing out after renaming eeveeloutions something else then restarting your device and sign back in... After that rename your Eevee the trick names and evolve! Like I said it works for my friends and I 100% of the time.