Is this sentence grammatically correct?
"Remember that we don't put an -s at the end of uncountable nouns to make them plural, but there some that already have an -s at the end - so be careful!"
I think it should be "but there ARE some"
https://www.bbc.co.uk/learningenglish/english/course/intermediate/unit-3/session-1/activity-3

Question

Answer

Yes, you are correct.  It was probably a typo (a typographical error) or an editing error.

ご自宅で快適に語学を学べるチャンスをお見逃しなく。経験豊富な語学講師陣の中からお選びいただき、今すぐ最初のレッスンにお申し込みください！