Help with starter

Hi my starter used to work perfectly fine.  I forgot to feed it one day about a week ago and ever since then it smells like cheese.  Not moldy or rotten cheese, but like a fresh string cheese.  I have continued to dump half and refeed like I do every morning, and the starter seemed healthy.  It has bubbles and passed the float test, yet the past two loaves I have made were dense and barely rose.  Todays came out like frisbees..  The bread still tastes good, it just isn't rising anymore.  I didn't change anything  in my preparation process.  Any ideas of what might be happening? Thank you