I'm only just seeing the tag, mine had obvious 'bite' marks in them and it was the tender yong chicks that were targeted first, so not the same thing, but I canrelated to this, I'm finding something similar. I'm getting semps going yellow and mushy for no obvious reason, right next to healthy ones, but as yet I'm clueless to the cause. It's only happening in my bed not the pots. apologies for the poor picture quality, it's dusk now. I'm not sure if you can see but the chicks are still green and healthy. The same happened last week with another one. I didn't have chance to do anything about it, but I noticed today that all the outer leaves died and went crispy, but that theres a new growth starting in the middle. My poor semps have been a bit neglected the last couple of weeks.