My guess is that the screws securing the island to the floor pulled out some and are preventing you from pushing it back down. I would remove all drawers and look for the screws under the island with a flashlight. Back the screws all the way out. Push island down tight to the floor, might have to sit on it or have help, and re secure the island using the screws you removed but move them over an inch or so into new wood.
Chris & Maria
2012 36RL, Full Body Paint, Dual Awning, Dual a/c, Splendide Combo, Fisher Paykel dishwasher, 6.5kW Onan, Goodyear G614's. 2015 F550 6.7l, 4X4, Lariat, CC, 176" WB, Long Box, B&W Companion