Issue with Water Body River not conforming to my landscape - UE5.1

my landscape is capped to 500m(height) and scaled according to it but to the point of issue… ive tried even smaller landscape scale and even placing new spline @ problematic place and none of that solved issue … it just generates weird edge curling(i beg for option to turn it off) @ edge of watter witch results in watter not reaching edge of “river bank” … no matter if i use “affect landscape” or sculpt manually … no matter how wide i set it to be in those points even neighboring ones … if it just decides it will not work @ that place i cant do anythin with it… to be fair sometimes (not always) sculpting edges of that landscape part helps with that issue but not always …