Jackson was a limited practice participant on Wednesday and Thursday last week as he came back from his hamstring injury. He was originally listed as a full participant on Friday because he participated in the entire practice, but did so while running the scout team.
The rule is that a player who would normally take starting reps but is medically unable to do so and instead works with the scout team must be designated as limited.
Upon realizing the mistake, the Ravens corrected Jackson's injury designation on Saturday, making him a limited participant and ruling him out of the game against the Chicago Bears.