As long as there is no staining on the interior concrete surfaces of the stem walls or on the wood structural members, and the moisture is contained for the most part under the vapor barrier, then the problem is of a minor nature. I would write it up as maintenance recommended or monitor this item, and recommend a periodic inspection by the homeowner. If the moisture is contained under the barrier, then the barrier is doing its job.

Additionally, the areas around the crawl space posts could be sealed to keep the water from wicking up from below. That is the easiest fix. Additional vents could be cut in also, given there is enough space and it is convenient to do so. This would help to keep air flow under the house to a maximum and help dry out any water that reaches the surface of the vapor barrier.

I find this situation a lot here in Northern California.

Chuck