slab edge splits

Hi
My slab is more than 3 weeks old and have just started framing. The roof is tile and I am nailing down bottom plates (45mm) with spaghetti and 90mm nails, 50 mm in from slab edge. Today I noticed that the slab edge is cracking free where these nails went in. The nails are the thicker gal bullet head and did take a bit of pounding. The thinner 75mm nails were gliding in too easily I thought. What am I doing wrong and can the edge be easily repaired. Thanks for any help.


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