"All the others" are the same lily? If they are not, then there is no relevance. Different lilies react and grow differently.
That's quite an abrupt growth change. If it doesn't seem normal, in other words, if you've actually never seen it happen before (think hard), then something has changed quite abruptly also. Any herbicide or pesticide application? flooding? Cultivation? Heat? .......
At any rate, there's probably nothing you can do about, unless you can pinpoint and alleviate the problem. It very well could be nothing, but the yellowing does point to some kind of stress.
I don't see much of anything wrong with your lily. It appears that it may be growing a little too fast; that's all. The fast growth and drooping leaves sort of go hand in hand with warmer weather and too much moisture (rain). It is a temporary condition and is most likely to occur just before they bud out. Yours appears to be ready to bud out soon. That's my opinion. Does anyone else have something to add?
, don't use any chemicals on the gardens
