Currency not displayed in Tax Slab creation

Please refer the screenshot. The currency is mandatory field without which I can’t create a tax slab.
This is a frappe cloud site, and I’m the administrator. This can’t be deployment problem or permission problem.

What could be the root cause, and more importantly how can it be fixed?

After 5 days no reply !
Does it mean this is a common problem and all the people are okay with it.