Today I was welding a 60 mm 1.6 thick stainless pipe which I don't have much experience with the fitting was a bit misshaped so the alignment wasn't great however I got my root through fusing both edges but once I capped the pipe it looked like I had some secondary penetration was wondering why this...

Hi I have been welding some 2inch 1.6mm thick stainless pipe and am needing help I got the root through ok although the pipe alignment could have been better however after doing the cap it looked like I had some secondary penetration on the root from this, any way I can prevent this?