Es por el frío? experiencias similares?

She looks perfectly healthy actually, I can't see any issuses.

Hi Bro, nothing to worry about. I can see an healthy girl at first stage of flowering. But the almost dark the color of the leaves and the twisted tips should advise you to take a closer look at a possible nutrient overdose, however not evident with confidence at this time and with only one photo. Be balanced and everything will be fine 👊

I would like to clarify that I am in week number 5 of life, just starting to flower, the temperatures are between 19-22 degrees Celsius during the day, and at night they drop about 5 degrees more approximately without the lights. Beyond that, I don't see signs of having overfed or overwatered them, it's the first time I'm growing in a bit of cold weather and I'm still figuring out how to cope with the milder climate. One new thing I've done compared to previous grows is LST, but I find it strange that this problem comes from there, I have 4 autoflowering plants and only 2 of them show this symptom.