This happens due to the rounding off activity in Zoho Invoice. When it is for one item the tax amount is 714.3. This is rounded off to 714. But when it is for two items, the tax amount is 714.3 x 2, this comes to 1428.6 which is the exact double of the tax amount. This is rounded off to 1429.
To make the invoice total 30000, as an alternative, you can edit the item price accordingly and save the invoice. We do understand that this is not the ideal work around, however this is an alternative.
Zoho Invoice team
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