This poll is different than most polls I've seen: they typically have an Approve/Disapprove/No Opinion choice. This one is somewhat different in that it adds categories: Strongly Approve, Somewhat Approve, Strongly Disapprove, Somewhat Disapprove, Not Sure. With those choices it's not that surprising to me that more people would "Approve" of the President's performance since that includes both the Strongly Approves and the Somewhat Approves categories.
If I were asked the typical poll, I'd say Disapprove. If I were asked this Zogby poll, I'd say either Somewhat Approve or Somewhat Disapprove depending upon the latest craziness out of the WH. I suspect many other Trump skeptics are in this same category. If Trump Supporters find this poll a reason to celebrate, good for you. What this polls shows is that only 22.3% Strongly Approve of the President's performance (smaller than I would have guessed given the support from the base that I thought he had) and that only an additional 22.3% Somewhat Approve of his performance. By far, the plurality of opinion are the 40.5% who Strongly Disapprove. Not sure that's particularly good news for this President.