HLOD Groups' Shadows Pop Up

Hello,
After creating the HLOD groups, we came to realize that the shadows of the groups are disappearing after certain proximity. Does anyone have any idea why that happens? Please see the images below:![alt text][1]

Sincerely,
Berke

It appears to be a distance setting, one or more of distance field shadows, cascaded shadow maps, or based on the differnent levels of HLODs. What are the settings for Distance Field Shadows and Cascaded Shadow Maps?

Here are the settings for the directional light: