I got a late start to my winter squashes this year. Mine are not much further along than yours. No flowers yet. A few are just starting to trail, but most look very much like yours. I'm hoping for a warm fall.

Sorry I'm no help as to why the leaves look a little yellowish.

Mine looks that small too. I purchaced mine from a fruit market, not growing it from seed. I also have a melon that is even smaller. I am glad I am not the only one. I just thought it was the cool spring that stunted the growth, but it is warm now.....Good luck.

Tonight I pulled 3 of my 4 plants, and truth be told, the last needs to go also. They never recovered.

Dont know what I did wrong, but, I now have plenty of space for fall planting.