Bulbasaur dont learn sleep powder at 13 lvl.why?

[xkisywax]

My bulbasaur at 13lvl not appeared a window with a selection of skill poison powder.why? my last account didn't have such problem.at level 13 appeared the selection window.why is this a problem?

 

[Luminance]

This is a client-side problem; Bulbasaur learns Sleep Powder and PoisonPowder at level 13, where the client can't process multiple move-learning messages at once. This issue has already been fixed in the upcoming client update.

Thank you for your understanding.