Whenever missiles are fired in clusters and a missile strikes the target any other missiles within the blast radius will end up taking a sudden weird turn, missing their target and not detonating on impact.
Their behavior can range from a sudden turn to bouncing up and down while moving lets say north while facing downwards.
This seems to only apply to missiles that cause an actual explosion unlike for example the chemical missile.

Used ICBM version: Self-build until this commit: 2a19265

After further testing i can confirm that normal explosives also repel missiles.