Confusing series labels

My grandson is addicted to the Ninjago series, but unfortanately it appears that he watched the Spinjitsu in the wrong order. Bouncing from Netflix (Had to use a VPN to trigger it to show then he could watch without it) to ITVX, we're UK based. According to AI, the spinjitsu series is wrong in Netflix, it has a series 1 followed by series 2, but they were not actually continuous and there's a big hole between them, which we might have picked up in another listing or ITVX, where it says series...