Jagged edge on half of outsude of carve

I am making a 3 columned arch for a friend, the middle arch is differant than the 2 sides in size and that it has a dragon on the top of arch, other wise everything else is same, I carved the middle one first and it came out perfect, the carved one of the sides the carve is nice yet the sides have these crooves and they are not consistant…help

This is the middle carve no jagged edge
this is the side jagged edge