Did you replace the hoses or the o-rings for the hoses when you did it? Those o-rings aren't very good the second time around.
Next point would be to check the plug (the one that holds the drain plug). If that was over-tightened or if it wasn't put in completely it can leak. Also, what radiator did you use? Some have two plugs and require different lengths for different applications: ie. For an automatic 328i the Nissens requires long plugs inserted on both sides vs the long and short that's installed by default.
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