Interview and late follow up?

I had a second interview online and I was supposed to hear back by email about the position today at a nonprofit. Instead, I missed a call due to a medical emergency and got a voicemail that told me to call back Monday morning to “go over a couple of things”. I’m not sure what this means and I’m stressed out about it. What does this all mean? I feel like they should have just told me about the position right away rather than drag it out like this

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