I can check this for Lumen Ceramics, but I cannot say why GA4 shows fewer sales yet. I will not guess a cause. I match records by script and turn each gap into a question to check. For that I need five things:
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orders (required): Your Shopify order export with order number, date, sales channel, subtotal, discounts, shipping and tax. Sales channel matters because some orders may come from outside the online store.
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ga4_purchases (required): GA4 purchase rows with transaction ID, date, value and event count, for the same dates. I join these to your orders to find orders with no event, events with no order, duplicates and value gaps.
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setup (required): How GA4 is installed: the Google and YouTube app, theme code, a custom pixel, or something else. The expected purchase value rule (subtotal minus discounts) is confirmed in my sources for the Google and YouTube app only.
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id_mapping (required): Which Shopify field the GA4 transaction ID shows, for example the order number or another ID. If this is unknown, I cannot line the rows up, and I will not guess.
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date_range (required): The exact start and end dates both exports cover. You said "last month"; please confirm the dates so both exports match the same days.
Please paste the rows as text, or a CSV if that is easier. I handle every row in order. If either export has fewer than 30 rows, the results describe those rows only.
Nothing in your store or GA4 will change. Any fix to tags, apps, theme code or GA4 settings stays HELD until you approve it.