Hello Greav

It will always happend that way couse when u win it says 10 mill coins but u see that u get over 20 mill coins couse its bug so when u keep using your coins and wasted your 10 mill that u won plus the original coins that u had left it crash on u or say desconected please refresh so when u do it goes back to the normal state of what u have left.

It has happend to me many of times even today it did.

I hope Dev,s can get that Bug fix and will be all good.