Why my workspace streches during "Navigate" ?

[KONPETROV]

Hi, i have  aproblem with my workspace and i cannot figure out why. While i navigate through my workspace at ArcScene, DEM streches , although i haven't changed anything at any settings. Anybody knoes why?

[DanPatterson_Retired]

and this image shows???

[KONPETROV]

that the image streches when i navigate from different angles. It shouldn't be like that. These mountains haven't so big distnace between them.

[DanPatterson_Retired]

not obvious from the images... or was it supposed to be a video that was attached?....although the last one has nicer colors and that surfing tunnel look... maybe the red dot layer is the culprit...remove it

[KONPETROV]

unfortunately nothing changed, any other suggestion why this is happening?