Are you trying to fillet each corner with a different distance? If you're just trying to fillet all of the corners with the same radius... you could just join all of your curves together into 1 polyline curve using the Join Curve component... and then fillet that curve with a single fillet component. See that attached image below.
Yes I try to have different distances applied so I can explore proportions
of a water server better instead re-sketching the curve again and again in Rhino.
when the 2nd element is a curve and the 1th and 3rd are lines
not only does the fillet corner node impact the way how
1 to 2 and 3 to 2 are rounded but it also affects how 2 looks.
Often curves even explode and make following tools fail
such as flip revolve and others.