Got this issue too, I planned a node 300 days in the future for a transfer window, then realized I was in a too low orbit for an efficient time warp (capped at 10,000x). Delete node, created a new one to raise ap, K2D2 refuses to do it.
Also, I am new to the mods world. Is there a way to efficiently bypass the warp limit from KLO to easily jump to the transfer window? Thanks!