Hi, Im not a native speaker. Those "some"s in your examples sound like "a certain" or "a" to me.
Here, I copied some entries from Longman Dictionary for your information.
used to mean a person or thing, when you do not know or say exactly which:
---- There must be some reason for her behaviour.
----Can you give me some idea of the cost?
some kind/type/form/sort of something
---- We can hopefully reach some kind of agreement.
（informal） used when you are talking about a person or thing that you do not know, remember, or understand, or when you think it does not matter：
----Some guy called for you while you were gone.
----Just give him some excuse or other.
used to say that something was very good or very impressive
----That was some party last night!
7 → some friend you are/some help she was etc