Help identify signs on the leaves

The only way we can recommend how to fix it is if we knew what it is you've been doing - that means a diary! Start a diary, even if it's only this past week and put in ALL information - pH, temps, humidity, nutes, etc ... at the bottom of the diary page, there's a box where you can ask a question... if you ask the question there, it will link the question to that diary and we can easily get to it to see what's up and recommend a solution....

I would love to hear how I can solve the problem?

Calcium deficiency.

First and forth photos first signs of nitrogen excess. rusty spots calcium issue, could be aftermath of nitrogen or ph swings .

You've got the beginnings of a phosphorus deficiency... without a diary, though, it's hard to tell you what to do about it. Check your pH, if it's between 6.2 and 6.5 consistently, then I would recommend the addition of a good PK boost... Good luck...