"Some" can be singular or plural, depending on the noun or pronoun involved.
1...With a noncountable noun or a singular noun or pronoun, use a singular verb.
There is some money....... (noncountable noun)
Some lucky person is going to win a prize. (singular noun)
Some of it is interesting (singular pronoun)
2...With a plural noun or pronoun, use a plural verb.
There are some people....... (countable plural noun)
Some lucky people are going to win prizes. (plural noun)
Some of them are interesting. (plural pronoun)