Many woods are water resistant.
I think the issues is the cracks. Likely denser grain and the finish did not absorb well, or the cracks exposed the end grain. Most woods will absorb more water from end grain vs face grain.
I think you will have a difficult time repairing the finish. It will likely be easier to sand the top down to bare wood and re-finish.
Try to find out the present type of finish from the store where you purchased the table.
I think the issues is the cracks. Likely denser grain and the finish did not absorb well, or the cracks exposed the end grain. Most woods will absorb more water from end grain vs face grain.
I think you will have a difficult time repairing the finish. It will likely be easier to sand the top down to bare wood and re-finish.
Try to find out the present type of finish from the store where you purchased the table.