Simple map (no triggers) demonstrating the sunken colony range bug. The sunken colonies will shoot the siege tank outside of its range about every 10 seconds.

Technical explanation:
The sunken targeting script works as follows,
1. Sunken looks for targets to attack.
2. Sunken checks if those units are in range
3. Sunken checks for higher priority target.
4. If higher priority target, attack that, if not, attack original target.

The bug is that the sunken does not check if the higher priority target is in range. The extractor is a low priority target, so the sunken wants to attack the tank instead, and sometimes switches and attacks outside of its range.
I believe this bug effects all static units that don't have projectiles (not sure about the projectile part). The reverse effect can happen with the siege tank, where the siege tank will shoot units that are too close to it.

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