Group Folders size displays (for example) "104,9 MB" when "100 MB" is set (quota)

The problem occurs for any group folders ; another noticed example : "524,3 MB" instead of 500 MB

Tested on Nextcloud 27.0.2 with GF 15.2.0

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Steps to reproduce

1. Go to GF management page and check size (create a new GF or change quota of an existing GF, if necessary)
2. See that displayed quota values don't fit what was seized by administrator

Expected behaviour

100 MB should be displayed if 100 MB was seized (for example)

Actual behaviour

104,9 MB is displayed instead of 100 MB

Server configuration

Operating system: Ubuntu server 20.04 LTS

Web server: Apache (fpm-fcgi)

Database: mysql 10.3.38

PHP version: 8.2.10

Nextcloud version: (see Nextcloud admin page)

Group folders version: 15.2.0

Updated from an older Nextcloud/ownCloud or fresh install: from older version

Where did you install Nextcloud from: Manually, regular web installer

Are you using external storage, if yes which one: local/s3/smb/sftp/... No

Are you using encryption: No

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/Saml/...

Client configuration

Browser: Firefox 117

Operating system: Ubuntu desktop 22.04 LTS

Logs

Web server error log

Can be provided if necessary

Nextcloud log (data/nextcloud.log)

Can be provided if necessary

Browser log

Can be provided if necessary