Murraya health help

Hello. I have 12 Murraya planted in a line for hedging. 9 are perfectly happy. 3 are not. Can anyone advise what might be happening please? All were from same supplier planted at same time 18mths ago.

Photo 1: close up of branch nodule growth Photo 2: three unhappy in a row Photo 3: healthy and unhappy planted next to each other.

Thank you!