Seems like he gave clemency to violent criminals over the objections of prosecutors and victims.
“There were several other cases of convicts who won clemency from Huckabee and then went on to commit more crimes, including Wade Stewart, whose life sentence for murder was commuted in 2004. Stewart was arrested this year, charged with carrying a concealed revolver. The Arkansas Democrat-Gazette found that nearly one in 10 who received clemency from Huckabee were later sentenced to prison.”
I disagreed with some of his clemency decisions, but there is no evidence that he abused his constitutional authority. He made a few bad judgement calls - then he learned his lesson and did a better job during his later years in office.