Hi there, abiram-vv.
This is very unusual that the GST is negative. The most possible reason is due to a browser error. You'll want to use an incognito window and check it from there:
Also, let's clear the cache since it causes issues in QuickBooks. Make sure that the browser is updated. You'll want to use a different one if there's available.
If this error persists, please reach out to our Customer Support for further investigation. Simply go to Help and click Contact Us.
I'll be here if you have more questions. Stay safe!
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