Chord finder is broken. I tried to use it just now for the first time, and was disappointed to find that the fingerings it presents are (a) not always idiomatic and (b) physically impossible in many cases. As an example, select F maj 7 and look at variations 2 and 3: absurd - they contain physically impossible fingerings.
While we're on the topic, as a left handed guitarist, I find the horizontal fretboard representation confusing. A vertical format conforms more closely to standard fingering notation and is easier for lefties (and probably righties as well) to use.
In case anyone on the team is interested, I would have expected to see the following fingerings for an Fmaj7 as they are the most commonly used that I'm aware of:
EADGBE
V1: 1 x 2 2 1 x
V2: x x 3 2 1 0
V3: x 8 10 9 10 8