Home-To-Him, the reason you can’t hear the h sound before מספר is that many native Hebrew speakers drop it and I think he drops it here.
As for why you can’t hear the ah sound before שני, I think that native Hebrew speakers, him included, say the final ר so lightly it’s almost unnoticeable, so the a of mispar and the fading of the ר makes it sound like mispa-a-sheni.
Thanks for your comments Theresa, I noticed that I wrote that comment 10 months ago, what is interesting and encouraging to me is that now 10 months later, I can hear a subtle and slight "ha" sound before שני, whereas before I could not hear it. It seems that my ears are getting a little better at detecting Hebrew sounds and combination of sounds. I am glad that you commented on my earlier post. Thanks.