submodule update not pulling latest libebur128 commit

[audionuma]

Hello,
doing :

$ git clone https://github.com/jiixyj/loudness-scanner.git
Cloning into 'loudness-scanner'...
remote: Counting objects: 3595, done.
remote: Total 3595 (delta 0), reused 0 (delta 0), pack-reused 3595
Receiving objects: 100% (3595/3595), 1021.12 KiB | 334.00 KiB/s, done.
Resolving deltas: 100% (2010/2010), done.
Checking connectivity... done.
$ cd loudness-scanner
$ git submodule init
Submodule 'ebur128' (git://github.com/jiixyj/libebur128.git) registered for path 'ebur128'
Submodule 'scanner/filetree' (git://github.com/jiixyj/filewalk.git) registered for path 'scanner/filetree'
$ git submodule update
Cloning into 'ebur128'...
remote: Counting objects: 3579, done.
remote: Total 3579 (delta 0), reused 0 (delta 0), pack-reused 3579
Receiving objects: 100% (3579/3579), 1.01 MiB | 588.00 KiB/s, done.
Resolving deltas: 100% (1971/1971), done.
Checking connectivity... done.
Submodule path 'ebur128': checked out '12145473831324d3b72b490f34c3d8993ba69b44'
Cloning into 'scanner/filetree'...
remote: Counting objects: 130, done.
remote: Total 130 (delta 0), reused 0 (delta 0), pack-reused 130
Receiving objects: 100% (130/130), 21.35 KiB | 0 bytes/s, done.
Resolving deltas: 100% (65/65), done.
Checking connectivity... done.
Submodule path 'scanner/filetree': checked out '38422e6b1e6421da3899e10ef70d32cdb004e550'

The latest commit to libebur128 jiixyj/libebur128@bc6dd06 is not pulled, instead commit jiixyj/libebur128@1214547 is pulled.