Yes, all nested comps start at 0 on the time line and the comp setting are all the same as well as the bit ratio. It is an unusual problem, I even copied the nested comp and placed everything in side of it and still had the issue.
I am compositing animations on video with one comp as camera A and camera B and the animations applied to the main comp. Every time I double click to enter the camera A or B the time code changes 10 seconds….very annoying