Yeah, that's weird. Depending on how you count least India, Pakistan, and Nigeria has more English speakers than the UK in absolute terms (Nigeria might end up either side depending on how strict you are), and Nigeria is on its path to overtake the UK as the country with the second largest number of native English speakers, as it's increasingly often the 2nd language of parents with different 1st languages.

E.g. my ex's parents had Igbo and Yoruba as their 1st languages, but she and all her siblings has English as theirs.