This is my first time using the FermZilla. The collection jar is open and some trub went into it, but now there's a buildup at the bottom of the cone and then a space of fermenting beer sandwiched between the trub layers. Does anyone know if this is normal for these kinds of fermenters? Should I be worried that there appears to be two separate fermentations taking place (one in the upper part of the fermenter; one below the large trub layer, in the collection jar)?