Batch file upload/delete errors from S3 external storage

After getting a new installation up and running, we are seeing issues with uploading and deleting multiple files at a time. Using S3 as external storage, if we attempt to delete multiple files at once it shows the errors below and it seems there is also an issue with the CSS for the error messages. This doesn’t happen before mounting S3 in the External storage settings. Any help or ideas of what to test would be appreciated.