Do you mean those on the left? Those are dwarfs and they look as they are supposed to
Whose yellow leafs were green at a beginning.. but there is a third leaf, just small, looks kind of like a potato leaf.. I have placed it today in another soil so it will have a better conditions to grow, hopefully.
In your seedling that yellow tips - its something I was getting in the future when I was "helping" some seedlings to get rid of the seed husk. Some of those tips went green but some just stuck at the yellow underdeveloped phase so I started cutting them off - and then the whole cotyledon [a bit shorter] could develop better. So what part I was mentioning as dry - was not those yellow tips but the edges of a cotyledon, at least it looks like this in a photo, maybe I'm wrong because its so tiny..