I'm not absolutely sure 'bout reasons and solutions.
I had this problem 2 times , don't remember exactly why and when ... but what i'm sure 'bout is that selecting the object, than displaying input/output connections within the hypergraph will show you these nodes called as "translate somthg ...." with, X, Y and W.
I simply deleted these nodes in both cases, without any visible change.
Try this, delete these nodes within hypergraph (after having saved your file with another filename for sure hehehehe)
Should be ok then
ps : if someone knows where it comes from, i also would be very pleased. It's the first "Maya dark subject" from which I had no more infos so far.
Thx in advance dudes :attn: