Buds doesnt develop 5th week flowering

Hey im new to grows and it has been challenging
The biggest of my plants had several problems as i switched to 12 hours of darkness
First it displayed calcium and potassium deficiencies and now it seems like a overfert spreading through leaves.
Buds are developing slowly and the plant hasnt grown in the first weeks.
A clone from the same plant is developing normally i think.
Will i lose this plant? It has concluded the 4th week and is in the middle of 5th of flowering.
Ill post pics so u guys look and help me
Thx u all! 20200825_152126.jpg20200825_152135.jpg
 

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