After going to the main quad kiwi page at
http://kiwisdr1.kfsdr.org:81/
selecting any of the four kiwis brings up a page that has a blank frequency box and even though I type in a frequency and hit return nothing happens on Chrome and on IOS it reloads to display the "Play" arrow icon in the middle of the screen.
I can confirm this happening to me on Firefox for Windows 99.0.1, Windows 10.
I noticed this morning that if I closed that browser tab and open it again a few minutes later (I went to get a coffee), it opened with 10 MHz WWV in use (as usual) and that may have been because someone in Switzerland had swooped in and grabbed the RX0 position. I don't know if that Swiss user had to do some extra gymnastics to get it to go to 10 MHz or not.
I don't use KFS that often (because it is quite popular) but by chance I used it last night (the first time in probably at least a month) and I noticed something similar. (I accessed the Omni from a saved bookmark, not from the "top level" menu you posted) and the first thing that I noticed is that the frequency input was not responding to changes. I ended up going somewhere else.
I have noticed similar weird behavior on certain Kiwis lately. (E.g., not responding to frequency changes.) It's random and not 100% repeatable. I have not made notes about which ones and when.