Question about a short spike on a phal

[myblue66stang]

My phal is in spike. I have had it for three years and have gotten it to rebloom twice after I received it in bloom. So, this is it's fourth spike since I got it. This spike is short, only two to three inches long and the flowers (actually the buds before they open) are already showing up and seem bunched together. Normally, the spikes get nice and long before the flowers "pods" appear, and I have no problem. What could have happened to produce such a short spike? The orchid itself is big and healthy. It is still in the same window that it has been in for the last three years. No other major changes. I feed it weakly weekly. Thanks for any help, Cindy