You always run into numerical inaccuracies! You cannot expect a 100% exact result when using the numerics with its IEEE format and its limited about 15 digits precision.
The numerics in your case thinks that the first value is non-real and so it is not plotted:
In the meantime you should already know what to look for and be able to find out things like that yourself.
I guess I don't fully understand above that, but a number with 30-decimal-digit It did show the point. And again : " I guess I don't fully understand above that " :