What should be checked first on-site when the compaction test fails after rain?

It is very common for municipal trench backfilling to fail the compaction test after rain. Once, we were rushing the schedule on-site; the material looked leveled on the surface, but the nuclear density gauge test failed. Some wanted to run the roller a few more times, but I told everyone to stop because the moisture content was already too high, and continuing to compact would just turn the…