What kind of value lists? Are they conditional value lists based on a relationship? No relationship, but based on values in a table? Custom values?
Take a backup copy and run a recover on it. Test the recovered copy. Do you get the same behavior? (Recovering a file rebuilds all the indexes in your field so that might make a difference here.) If that fixes the problem, save an empty copy (clone) of your current flie and import all the data from your current copy into this clone. That will also rebuild the indexes. Test this copy and if it fixes the problem, use it to replace your current copy.