This isn't an error of any sort. I just find it weird that while Bandicam and Fraps all have their framerate counters refreshing every millisecond, and Action! refreshes once a second. I think this would be a great addition in a future update.
I have heard from multiple places that Action! uses vSync when recording. If you want higher fps while recording, try changing your Video Framerate to 60 or even 120 under the Video Recording tab.