In MS project, when I updated the "actual finish" dates of some tasks, the formatting of Gantt chart bars on some of the following/dependent tasks automatically changed to be thicker/taller than they were. Why did this happen / what do the thicker/taller bars represent? Can I reset the formatting to the original?
I don't believe the bar changed it has merely shifted to the right and is showing more of the original bar. If you compare the "unexpectedly changed" bar to the bar above it - I believe you'll see they are the same. When you shifted the schedule, it is no longer partially hidden by the baseline bar.