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Hi, I read your post and follow the guide to measure the system wide latency. However, I met a problem which confuses me.

I found out that for the same header.stamp, there are cases that an earlier node has a late wall clock compared to a later node, I wonder how that's possible. For example, I'm recording the header.stamp in an earlier node /voxel_grid_filter and the latest node /twist_gate. I found for the same header.stamp, the wall clock for /twist_gate is 20h 35m 19s 300ms, yet the wall clock for /voxel_grid_filter is 20h 35m 19s 309s for example. Is this possible?