Settings just don’t change, somewhere along the line you changed it. Assuming that it set correctly without checking at the start is dangerous.
But if you start a new sequence, just drag a clip from the 7D onto it, it was ask if you want to change the seq to match the clip, click yes. Delete the clip. Go to the old seq, select all, copy, then go to the new HD seq and paste all the edits. Select all the clips on the new seq, right clip> remove attributes> Basic Motion and Distort.