@Alexlton Thanks for the suggestion, my friend. Really appreciated 
I don’t have a Windows install so can’t try that command, but I have a few Linux distributions installed, and I’m able to mount the NTFS partitions from those distributions without any issues. Also, I’ve tried the following command,
sudo ntfsfix /dev/sdX
On my partitions and it hasn’t shown any errors.
More importantly, I’ve run the following command on ntfs3g package,
emerge --pretend --verbose sys-fs/ntfs3g
And, the following USE flags are set there,
USE="acl ntfsprogs xattr -debug -fuse -mount-ntfs -ntfsdecrypt -static-libs -suid"
Don’t you think fuse mount ntfs suid needs to be enabled to mount the partitions successfully?
And, as I mentioned previously, the following forum post has described the exact same issue,
I hope this will be of some help in understanding the issue I’m facing.