Slab table is cracking, warping, wood slab fill patch
Was the table reinforced with metal to help to stabilize it? We like the moisture content in our slabs below 13% to help be sure the slab is stable. If the slab is warping or moving, cracks can occur and patches or fill areas can become separated. We would reinforce the underside of the slab-like we do in this video.
After you stop the current movement you can sand everything flush and then apply another clear coat, or you can sand and polish the surface as is. Here is a video on how we sand and polish.