Can someone help me - What's wrong with these plants?

[BENNY 420]

Does anyone know what's wrong with these plants they are in week 5 of flower I'm using Roots organic soil I'm using Botanicare products liquid Karma Cal Mag Plus bloom and sweet Raw I water with nurse every 3 to 4 days as needed depending on soil at a pH of 6.6 has anyone experienced this or know what's wrong

 

[closetcasecfl]

Hard to see on those pics but it looks like Bud Rot

Try this:
Air circulation - Make sure there’s always plenty of air moving over all the buds and leaves, and through the plant. This can take careful planning.

Don’t let plants get cold, if possible - Temperatures warmer than 68°F (20°C) help prevent fungus spores from germinating.

Avoid wetness - Don’t allow buds to sit in damp or overly humid conditions for long. Bud rot is a fungus, and like all fungi, it needs a wet place to germinate.

Remove all affected buds - Carefully remove and discard all buds with bud rot, as well as nearby buds - this is incredibly important if you don’t want to lose the whole harvest! Don't let anything any of the rot touch other parts of your plant.