This problem seems to vary with your choice of web browser. I am usually using Firefox 59.0.2 (64 bit), and I get the one line only for worker status (see my screenshot above.) But when I tried Chrome 65.0.3325.181 (Official Build) (64-bit) the worker status looks fine, shows both miners and the coi...

Same here. I am running 2 miners.
https://imgur.com/a/dKl8V