The rains may have cause the spike to rot if it never had a chance to dry out. Also if water was trapped between the leaves, they could develop bacterial or fungal problem. Since it was recently re-potted and roots and bulbs seem fine, I would spray it well with Physan and put it in a place where it doesn't get rained on heavily. Just water the media. Are you bringing it inside for winter? These don't prefer real hot temps but wouldn't want temps near freezing either. I think they should be grown a bit drier in winter.
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