How to do/fix clone stamp tool in Adobe photoshop?

Hi guys

I'm really new to photoshop but I was previously able to clone stamp my photos properly this summer and I have photoshop 2020 but for some weird reason my clone stamp tool isn't working and I get the circle, i hold OPTION and click and then release option and then click again and the drag while clicking around but its not taking the source and painting it over any pixels... 

I tried to reset the tool but i couldn't even figure how to reset the tool either! If resetting the tool still doesn't help what do i do? is there someone in Adobe or something that I can ask for help??? 

Please please helppp. Thank you sincerely. 

Update:

I even tried doing the adobe tutorial for clone stamp tool and even there it doesn't clone the bouquet of flowers for me...

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