'AWS Redshift COPY on S3 incorrect bucket region in ap-southeast-1

I had setup an AWS Kinesis Firehose (delivery stream) on ap-southeast-1. Both Redshift and S3 were also setup on ap-southeast-1. I used Kinesis Firehose to allow Redshift to manifest S3 bucket. Code:

COPY firehosetransactions FROM 's3://firehoseredshift-switt/<manifest>' CREDENTIALS 'aws_iam_role=arn:aws:iam::<aws-account-id>:role/<role-name>' MANIFEST json 's3://firehoseredshift/jsonpaths.json';

However, in Redshift the zone is showing as ap-southeast-1c. From my understanding, it is still in the same region but Destination error logs showed "Redshift.IncorrectBucketRegion".

Redshift attempted to use a bucket in a different region from the cluster. Please specify a bucket within the same region as the cluster. ERROR: Problem reading manifest file - S3ServiceException:The S3 bucket addressed by the query is in a different region from this cluster.,Status 301,Error PermanentRedirect Detail: ----------------------------------------------- error: Problem reading manifest file - S3ServiceException:The S3 bucket addressed by the query is in a different region from this cluster.,Status 301,Error PermanentRedirect,Rid

Are there any suggestions how to solve this problem? Thanks