In /etc/profile.d/kde.csh, there's a line which says:

  echo ${PATH} | grep -q ${kdepath}

This doesn't check whether an entire PATH component matches ${kdepath}; it
may match a substring of a PATH component (e.g. if kdepath=/usr/local/bin,
and I have /usr/local/bin/scripts on my PATH but *not* /usr/local/bin, grep
will still exit with a success code...bad example, but you get the idea).

Presumably a better plan would be something like:

  echo ${PATH} | egrep -q '(:|^)'"${kdepath}"'(:|$)'

Similarly in /etc/profile.d/kde.sh