Wrong zoom level or NaN zoom

Hello, I am using this library to generate multiple mapbox static map with differents bounds.
I have 4 generated maps and 3 of them have incorrect zoom:

the good one :

const viewport =  geoViewport.viewport([40.7127281,-74.0060152,48.862725,2.287592],[877,1240],0,20,512);
//  { center: [ 44.78772655, -35.859211599999995 ], zoom: 2 }

result =>

One of the 4 generated maps gives me a wrong zoom level :

const viewport = geoViewport.viewport([36.1672559,-122.419,48.862725,2.287592],[877,1240],0,20,512);

//  { center: [ 42.51499045, -60.065704 ], zoom: 3 }

I should have bounds between San-Francisco and Paris but it gives me this =>

(The center coordinates are good but zoom level isn't)

And the 2 others viewport gives me "NaN" zoom:

const viewport = geoViewport.viewport([36.1672559,-122.419,37.7793,-115.1485163],[877,1240],0,20,512);

//  { center: [ 36.973277949999996, -118.78375815 ], zoom: NaN }

and

const viewport = geoViewport.viewport([37.7793,-122.419,40.7127281,-74.0060152],[877,1240],0,20,512);

//  { center: [ 39.24601405, -98.2125076 ], zoom: NaN }

I always use the same function in my code and WSEN array of bounds is always respected.
I am a little confused about what happened here =/

Did I missed something?

Thank you =)

Start at the geoViewport.viewport entry point and reproduce the three bounds examples with the stated dimensions, zoom limits, and tile size. Compare the returned center and zoom values, then verify that the San Francisco–Paris cases produce a finite zoom that fits both bounds and the expected map extent.