Custom flowing fluid texture is enlarged

Hello

I have created a custom fluid texture, and the 'still' state work perfectly fine, however the 'flowing' state makes the texture enlarged.

I've tried to save it in formats like 32x32, 64x64 but it does nothing.

Can anyone please tell me what can i do to make it work?

P.S The fluid texture is supposed to be a thicker lava. I've tried to set the values of density and viscosity to higher then vanilla lava,

but it seems to have no effect, and the fluid flows just a little bit slower than lava.