What the hell went wrong ?!?!?!

this is my first crop, im using madala hashberry seeds and growing outdoors in london, i have to healthy females but one is all twisted with curly dry leaves and an odd colour, despite this its still producing buds though, can anyone tlel me whats wrong

Thats a deficiency but i d have to look it up. The yellowing from the middle out gives it away. If I find it Ill post back

Hi growing in uk myself, nice to see some fellow gardners out there, your problem is a magnesium deficiancy from where i'm smoking at least, alka seltzer normally does the job, i gave two tabs in three litres of water and they came up lovely