How to modify the timestamps in my Rinex files

We’re currently doing PPk on a lidar data acquisition mission using a Zenmuse L1 and a 300 matrix. Before each acquisition, we let the RS2+ base run for about 30 minutes and then start our acquisitions.
On our last mission, we proceeded as usual, but this time, the timestamps of the base and those of the photos didn’t match and caused a problem during processing.

In your opinion, what can we do about this? And what is the source of the problem?