You guys do not have a clear Idea about planting a fig tree!.
You plant deeper in climates where frost is severe in Winter,and you plant higher , especially in warm,and rainy climates .
In the first situation,is to preserve some growing buds at base,in case ,the tree is killed,in the second case,is so the plant roots will not rot,from too much water.
You plant at the level it was in pot,only in ideal,warm and dry climates.