Biogas silage pits elevation bug

[Jahni Slim]

In FS15 I have a Westbridge map. The silage pits in the biogas plant seem to have an elevation error, where the material, either grass or silage fall under the ground. I had a pit loaded up to 11% with grass and when it matured into silage, I could only see the very top of the silage graphics, and was totally unable to scoop any of it with a telehandler. I then dropped grass into the next pit and it fell through the ground as well. I loaded the previous save before the original grass turned to silage, but the bug persisted. I haven't tried on a new map yet.

[Jahni Slim]

http://i.imgur.com/MVDChEa.png

[Jahni Slim]

Might help to get an answer if I were to post in the correct forum