I built all of them flush to start with which caused the tracks to not be very long enough, so the 3rd leaf overlapped the sting from the table by about a single centimeter. Leaving that added inch (with the block sticking earlier the tracks) will let you correctly extend https://lanewyazx.mybjjblog.com/the-fact-about-modern-extendable-dining-table-rectangle-sideboard-with-storage-that-no-one-is-suggesting-43027239