Why EXT-3 filesystem is showing errors related to EXT-4 in logs?

Issue

• Upon some issues with an EXT-3 file-system, the log files indicates that the errors are related to EXT-4 file-system.

Mar 28 14:25:16 uk01dcis001 kernel: EXT4-fs error (device dm-2): ext4_lookup:1441: inode #9216782: comm java: deleted inode referenced: 22112678
Mar 28 14:25:17 uk01dcis001 kernel: EXT4-fs error (device dm-2): ext4_lookup:1441: inode #9216782: comm java: deleted inode referenced: 9220900
Mar 28 14:25:17 uk01dcis001 kernel: EXT4-fs error (device dm-2): ext4_lookup:1441: inode #9216782: comm java: deleted inode referenced: 9220457
Mar 28 14:25:17 uk01dcis001 kernel: EXT4-fs error (device dm-2): ext4_lookup:1441: inode #9216782: comm java: deleted inode referenced: 9219454
Mar 28 14:25:18 uk01dcis001 kernel: EXT4-fs error (device dm-2): ext4_lookup:1441: inode #9216782: comm java: deleted inode referenced: 22114050
Mar 28 14:25:18 uk01dcis001 kernel: EXT4-fs error (device dm-2): ext4_lookup:1441: inode #9216782: comm java: deleted inode referenced: 22111218

• /proc/mounts and blkid, it shows that the file-system is of type EXT-3.

/dev/mapper/datavg-lvol0 /opt/ci ext3 ro,seclabel,relatime,data=ordered 0 0
/dev/mapper/datavg-lvol0: UUID="8ba0e095-a9d1-40c7-ad65-d428676d78ce" TYPE="ext3"     <==============