material looks bad and glichy problem

i have pool table in my scene and directional light , the problem that i cant make the material on the edjes looks normal and okey (the brown part of the table i added pictures for reference), the material dosn't have texture and this standart shader, the material looks glichy/part of the material cut and seems too dark on the edjes of the table , i dont think its matter of the angle of the edges between the table and the direction light couse the area where the glichy look occurs it's on the same angle/side on the table, the directinal light is in angle of 90,0,0, i dont know exactly if the problem it's becouse i use directional light or becouse somthing with the mesh or somthing else , mabye i need to go with another method of lightning and not directional light, i dont know so much about lighting techniques so if you can give me direction it would help me, thanks in advance

 

Check the model to see if there is a split edge there, or overlapping geometry.