uhm, grey with no tiny letter next to it? should be values that are at null value. so either you used Make Null (but then there would be a tiny N next to the value) or so far you never recorded that value into a cue (because then it would have a value either from tracking or because you recorded a value).
If you take moving lights and run them in a list and then off the list the values become grey and have no source in about. Now I get why the lights do not go home when you off a list, although I do with that offing a list was a go to q out at the list level, but I dont get why the values are grey an have no source. Does the desk just make them null when you off the list?
