Wyvern Rend missing at close range

Playing through most of the campaign using Rend (Wyvern auto-attack), the buffed lightning version misses enemies a lot at very close range. This mainly happens to small enemies like Act 3 swamp mosquitoes and Act 2 beetles. Buffed Rend constantly misses any enemy slightly to the left or right of me. I need to keep turning around to swat one or two enemies at a time.