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Not a physics heavy at all, but once got a mediocre degree with honours in astrophysics, so I'll put in my two cents' worth.
As Bojan correctly points out, this is an aspect of stellar evolution. My understanding is that this is a field where the basics are quite well understood (gravitational collapse forming a star, progressive fusion from H through the various metals, finally leading to various things like supernova, white dwarf, black hole etc).
On the other hand, the finer details are much less understood. What you are talking about is definitely a finer detail.
Based on my limited understanding and a quick trawl of the web, I don't think what you suggest is 'known'. On the face of it, I can't see why it would be the case, however that's certainly not a reason to believe it isn't. So don't assume there is anything wrong with posing the question.
As Robert suggests, a sensible and worthwhile thing to do is make more observations. Maybe it will turn out there is no effect generally, and you just saw something random. That alone is something worthwhile. On the other hand, you might find there is a real and general difference. That would be very interesting.
I'd love to hear about progress if you pursue this.
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