I think the reason is your tables layout in the Excel file.
When you manipulate the first table ( as you did ), it created a side effect against the second table, which gave you insertDeleteConfilict error.
Option 1: Consider moving the second table to right of the first table.
Option 2: Separate the action.
Keep the first table in your template, remove the second table from the excel template.
After 'Add a row into a table', Add 'create table', Here define the table name, table range, column name.
Option 3: Add Id column to your first table in the excel template file.
Before 'Get file content', add 'Update a row' to update the first table in the excel template.
Change your 'Add a row into a table', to manipulate the second table.
There are also many other solutions/Options.
good luck.
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