This is what happens when you don't read a pattern properly!
I made the whole second round of chains with four picots… and there should have been three!
"snip, snip, snip"
Those chains felt really tight with only three picots but I carried on as written. Now the third row of chains and rings frill a bit. This makes me think Mr. Fikkert and I don't tat the same (ie. have a different tension). But I'll keep going and see how I get on.