hmmm, well thats weird.
That suggests either....
a bug in the latest chrome that is also in firefox (which would be weird) or that someone's pushed a button somewhere and screwed things up (but then you would expect it to be replicated in all browsers).
Its fine here in
Opera Dev 44.0.2494.0 (My main browser)
Opera Beta 43.0.2442
Vivaldi 1.7.735.36 (My secondary browser)
Chrome 58.0.3000.4 (Latest Chrome)
Firefox 51.0.1
Edge, dunno what version, pile of hogshit it is, sherdog one of the few things that does actually work in edge.. never thought microsoft could make something shitter than internet exploder, well they managed it..
If its both Chrome and Firefox that suggests Sherdogs end, but the text entry is a pretty fundemental part of the core of xenforo so maybe a recent update has screwed it.. but weird that its not replicated in opera or vivaldi (both chromium based)