Water source creation at random after a random time using a on/off watersource.

Hello

I use a watersourceblock blocked by a block and a piston.
when piston retracts the water goes 8 blocks or +7blocks. After some time the water starts to create source blocks at random in the +7blocks area. And I go and remove them. The same effect does not happen to lava, overworld or nether.

Regards,

Marcus Sanler (ariana gaming)