As usual in astronomy, it was just a selection effect.

After a bit more digging, the truth emerges. The Kepler telescope was originally designed to concentrate its search area in the Cygnus Milky Way, an area where there were lots of stars, and far from the ecliptic where the sun might interfere with its observations.

However, after some mechanical failures with the satellite's maneuvering gyros, its mission was changed to concentrate on the ecliptic instead, where its reduced pointing capability and its need to orient its solar panels to the sun could both be accommodated in spite of its reduced capabilities. Kepler was tasked to conduct a survey of our ecliptic plane, instead.

So it is not unusual that it has been finding suns whose ecliptics are aligned with Sol, on our ecliptic. Not a coincidence at all.