Hi ChzRanger, I'm no expert, but I have made a few batches of feta, and have not encountered this problem, might I suggest that you look up a different recipe and see if you still get the same result or not. You don't mention which type of starter you are using, I use Flora Danica, 1/4 tsp to 10 ltrs(2gal) and 1/4 tsp Lipase to 10 ltrs (2 gal), rehydrate in 1/4 cup of cool boiled water 10 minutes berore adding to the milk, I also use 2ml (about 1/2 tsp ) of Calcium Chloride to 10 ltrs. Are you using raw milk or store milk?
Use Google, or whatever site you use, and enter in the search engine, 'how to make feta cheese' and see what comes up, there are plenty of other recipes out there. good luck