When flowing lava comes into contact with flowing water, it is possible to produce cobblestones instead of stones.
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The water and piston seems probably causes by MCPE-171416
Probably have something to do with update orders.
If you place water first, then let lava flow into water, it works as intended.
[media]However, if you place lava first, then let water flow into lava, it will produce cobblestone.
[media]We are tracking this issue at MCPE-21038, so I am resolving this report as at duplicate.
To get reliable stone generation try a 20 game tick (10 redstone tick) clock.
I'm not part of the moderation team here, but I can tell you that they only accept bug reports in English. Could you please edit it to be in English?