I've seen this as well though luckily just with an enemy artillery.
Information: AMD Ryzen 7 5800X 3.8 GHz, RTX 3070 8 GB VRAM, 16 GB RAM, Windows 10, 2560x1440, 100-110 fps.
Detailed description: Artillery callout by spotters slightly off the board. Re-measured twice before firing HCHE shell, once after. Photos from after shell hits also don't show a target at the expected position on the edge of the map.
There is another artillery nearby which I had prior knowledge of (which is why I put an HCHE between them). But unless the spotters can have a high degree of error, it seems too far away to be Artillery 7.
Impact: Minimal. I might have spent RC on different targets if I hadn't targeted these two with HCHE.
Reproducible: Unknown.