Being as the number 8 was important to Franklin and he did have pretty bad OCD specifically with numbers and dates I thought it worth mentioning that he HAD to have his official number of convictions at 8. I believe this is because he was pretty much obsessed with numbers and 8 was a good number for him.
From Chat GPT: Joseph Paul Franklin was a serial killer and white supremacist who was convicted of eight murders, but he claimed to have committed as many as 20 killings. However, it is possible that he may have been responsible for more murders that have not been officially attributed to him. Franklin was executed by lethal injection on November 20, 2013, for the murder of Gerald Gordon in 1977.