GRUB loader Issue

Hi,

Doing a triple boot of Windows, Kali and Mac OSX. Windows and OSX were on fine, but when I went to install Kali it wanted to install GRUB, it left location as blank and continued. But now for some reason my Kali partition seems to have merged with windows. I'm also not able to access windows, I'm hoping its just the GRUB install I've buggered, how can I correct this?

Thanks

 

Looking again, the Kali partition is still there when I check fdisk. When I boot holding option I only get OSX & recovery now.