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You are not the first to experience this problem.

Robocode 1.9.3.0 and its predecessors produced visual glitches with DPI scaling enabled (Bug-394). Fnl's workaround for this in 1.9.3.1 was to have Robocode disable DPI scaling entirely. Unfortunately, this causes the UI to appear very small.

The ideal solution, of course, would be to have Robocode support HiDPI properly. But that would mean changing a significant amount of UI code to take DPI into account, as well as modifying the graphics system so that the battle view can be scaled up arbitrarily high without losing quality. That would take a lot of work.

Only a few lines of code need to be changed. The glitch is caused by a bug, otherwise Java has already had perfect HiDPI support. See PR #62.