i think you can work it out yourself , if some were going well and some were striping . Was it the same substrate were some were good ? Was it the same day ? Same bags of multi ? Were the stripes at the bottom of the wall ?
Cheers for the replies lads, the one that tigered I tried the apprentice mistake of trying to flatten with a refina super flex 2 (mediflex) after seeing some lad on Instagram reckoning you could, next trowel after that was probably more edge and pressure which could cause them?