June 26, 2015, 06:54:45 am
Welcome to the forum and Lumion.
No. That's just how Lumion displays some shadows in Build Mode. In Build Mode to maintain the real-time working environment and FPS of the screen, parts of the scene such as shadows are displayed as an approximation.
When you render in Photo Mode or Movie Mode, Lumion will apply higher quality shadows (you can also set quality aspects via the Shadow Effect).