The product is End Of Life guys. No more money will be invested in it. Send them money, or find a different solution. I use Snagit 2018.
I'm afraid it will not be fixed. Skitch no longer will receive updates since it's life has been ended. :-(. A shame, it is one of my most used tools. Alternative, but you need to purchase it: https://www.techsmith.com/download/snagit/ (the same folks that created the beautiful Camtasia)