If you control multiple Cursed Wombats, each permanent you control will have that many instances of the granted ability. These abilities are not redundant. For example, if you control two Cursed Wombats, each with no +1/+1 counters on them, and you activate the adapt ability of one of those Cursed Wombats, you'll put two +1/+1 counters on that Cursed Wombat, and then each of its granted triggered abilities will trigger. When those abilities resolve, each one will put an additional +1/+1 counter on that Cursed Wombat. Since those abilities trigger only once each turn, those additional counters won't cause those abilities to trigger any more that turn. (Curses!)