I have noticed the miny / maxy might not be correct in the return_calculated_values of PNF (maybe in renko as well?)

The returned values:

miny 137.33999633789065
maxy 181.83999633789065

The chart:

pnf chart

Further, how is minx and maxx to be interpreted, as the x-achis is a timeline, but the values are decimal?
minx -0.9777777777777777
maxx 44.977777777777774