Why are seals leaking after replacing with original Infiniti

[garrydixit]

the previous owner had installed after market front seals so i got them replaced with same part no. with Nissan original seal, and still are leaking. i have got them installed from a reputable mechanic and had the axles off 3 to 4 times.

[abdullad]

Check the mounting surface on the axle side. You may have seen some scratches, nicks, or a non-flat surface causing leak, even with the seal in place.