Duplicated objects stored in AWS

So I am uploading any images or files from my self-hosted Ghost instance to an AWS S3 bucket following the S3 integration guide in GIthub (GitHub - colinmeinke/ghost-storage-adapter-s3: An AWS S3 storage adapter for Ghost). When I upload an image I get two copies of the same file, one with a ‘_o’ suffix as shown in the image below. I assume one is the original file and the other one is the compressed file but still it’s just increasing the storage in my S3 bucket.

Any ideas how to store just one file prevent this? Thanks!