Interesting. I have a Wilsonara that bloomed late winter and I didn't really pay attention until a month or so ago to the fact that the spike came from the top, from within the two top leaves, not from the base like its first spike. Also this last pb to bloom grew normally off the one that bloomed before it, however it is the previous pb that started a new growth months before I noticed the younger one started to grow one. Different but somewhat similar to your experience and my plant seems to be doing alright though the new growths are coming along slowly. Good luck & keep us posted if anything else strange happens.