Do you think it is relevant? Are you using rootless Docker or user namespaces?
If you all use UID 1001 and GID 1001 then the files you mount from the host must be owned by UID 1001 or at least by the GID 1001 depending on who have permission to those files.
The files you want to mount was probably created by a user with UID 1000 you you have to fix it.
PS:: I am wondering what you think how easily your post was readable before I edited it to add code blocks 
Please, always use code blocks for code and alway check the post after sending it to make sure it appears as you expected it. Tips: How to format your forum posts