Probably due to IP transfers between regions. The original /8 was assigned to ARIN (which handles IP addresses in the US), and then later a more specific subne

Probably due to IP transfers between regions. The original /8 was assigned to ARIN (which handles IP addresses in the US), and then later a more specific subnet (like a /16) was transferred to RIPE (which handles the European region). So while the big block is correctly shown as North America, the smaller ones shouldn't be.