This is a calmag problem. You have a deficiency, and calmag will solve it.
It’s a product you can buy and feed ur plants with it contains calcium and magnesium.
Your plant won’t recover the burnt spots but will prevent more to come.
And you can also spay it on the leaves to recover faster. But be careful with it! It’s very strong. So read the instructions carefully before using it.
Good luck my friend 😁
More info would help,agreed the symptoms are showing calcium deficient but there could be more going on. wondering if the ph is off causing lockout or just simply getting hungry since in week 7.