I have tested this again in Modpacks on version 1.7.10 and Vanilla Minecraft and no Bugs occured while pasting. On higher Minecraft Versions, such as Minecraft 1.10.2, it does happen apparently. I changed the description, such that this was build in Version 1.7.10. If you want to have this schematic on a different version, please write this down in the comments.
The enderchest could be more of a paste problem because I had mods in the client ansich I see also the grade I forgot the Shematic on 1.7.10 bassiert and I for higher versions do not know how they will get there but now me Take time and build it on vanilla in version 1.7.10