The main problem with your example comes from the width of the tabular. For illustration consider the following sequence of
You'll see that there is extra vertical space before the line that is wider than text width.
In your example, the tabular has width
130mm plus the intercolumn spacing and the log file tells you that the line is overfull by
60.8858pt. Reducing the dimension of say the last column, the anomolous spacing disappears:
This is a line.
This a new paragraph.
1 & dskhkdfahsk & khskdahfkhk\n
2 & two & three\n
flushright adds some extra vertical spacing (
\topsep, standard value
8pt plus 2pt minus 4t, but set to
0pt by the
parskip package), but this on its own is not as dramitic as what you were seeing, unless the contents are overwide.
flushright acts like this because it is defined as
which creates something akin to
on the first line. LaTeX then finds an allowable break point at the
\hskip, and when the line is overfull, can choose to break there.