Just to get back on this, as others have said, this looks like a perfectly healthy spike which is still in its expanding phase and all you need it a little patience.
I have two orchids at the moment who are growing both a leaf and a spike at the same time (due to the hot late summer, they apparently thought it was a good idea to form a second leaf just before temperatures dropped which caused spikes to start setting).
What happens is that the plant prioritises one over the other, which may switch at any given time. The orchid may have suddenly decided after growing the spike a few inches that the leaf had precedence and so stopped growth in the spike. At some point it will switch back to growing the spike, which will expand and bloom this year. It will just take longer than your other orchids only growing a spike. Also, even with that prioritisation nutrients are still divided over two different structures, so naturally growth in both leaf and spike is slower.
P.S. Really, the value of fertiliser is exaggerated, especially for phals. You can grow phals and oncidiums without the use of any fertiliser (or supplements of other sorts) whatsoever, though e.g. leaves might be slightly smaller. A spike on a healthy plant will not stop growing due to a lack of fertiliser.
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