Huge yeast cake after ferment

[Motoguy23]

I'm pretty new to this thing but I have made 8-10 runs and I'm really enjoying this new hobby.

Now, the mash I make is a simple one: cracked corn, sugar, water, and new yeast. I've used two different types and its happened with both of them (safale us-05 and Lallemand Nottingham). I let my mash ferment and when I'm siphoning it off into my still, I have a gigantic yeast cake like 10 inches wide and up to 6 inches thick. I can only use like 7 gallons of the original 12 gallon wash I made because the rest left in the pail is a big gelatinous blob. It hasn't happened everytime, but the last like three times it has.

I sanitized everything before use so I don't think its bacteria.

To make matters a little more complicated, I made my first batch of all grain with the same new yeast and let that ferment and siphoned that into the still tonight and there was hardly any cake at all. Pretty much just a much thinner layer of scum at the bottom, though it did bubble up and out my air lock.

What I'm wondering is if this is normal and I'm just giving the yeast a fantastic place to breed or is there something wrong with my process?

[bellybuster]

Normal, some yeast cakes are bigger than others depending on the amount of solids. Time will compress a yeast cake so will crash cooling. You can pour new wort right on top of that bad boy