My org recently switched to Lightning - in Classic the subject field for tasks was predictive based on what a user has used in the past. In Lightning this does not work - however, the user can switch back to classic and it will still work. After initial research the only thing I can find is that clearing browser cache ~might~ work. I have seen several places where people are asking about this but there are no definitive answers. Have others ran into this? If so, how have you fixed it?
You may want to check the Lightning Task settings and browser cache first. Also try testing with another browser or user profile to rule out a local issue. If it works correctly in Classic but not Lightning, it may be a Lightning-specific limitation or bug rather than a cache problem.
