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A/B test becomes unbaleced over time

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Hello everyone, 

I'm facing a problem with an A/B test, so here's some info:

  • I observed that shortly after being launched, a test setted 50/50 started to become 20/80.
  • Right after this, it ran unbalanced for approximately 10 more days, and then tried to return to 50/50, still stumbling.
  • Auto-allocate is turned off.
  • Most of the traffic is going to B, the challenger version.
  • It is implemented on a webpage.

Has anyone experienced this before? Could it be an implementation issue? Any tips?

Thanks already!

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