I just made an example log file on my laptop with the following name:

/home/carns/carns_mpi-io-test_id1630396_3-23-34335-6476557813076353691_1936.darshan

The _1936 component is supposed to show the (rounded up) number of seconds it took to produce the log. This example job only ran for a few seconds, but the time reported here is > 30 minutes.

This isn't a crucial feature, and nothing is wrong with the contents of the log, but it's nice to have as a sanity check for a system-wide installation. Probably a simple bug somewhere.