We have checked for this issue from our side on various PHP versions but we have not encountered this issue on any of them. So this issue can be a server specific issue.
So I recommend you to raise a ticket at https://webkul.uvdesk.com/en/customer/create-ticket/
And on the ticket please share your FTP details and the QloApps admin details with us.
We will hunt down the issue and resolve it.
As I mentioned earlier also that for those fields whose translation does not exist by default system show those fields in default language rather than showing them blank.
And the only way around is to translate those fields manually.