It might be because of caching. Please change the browser and try it?
If it did not work, then please ping me here.
I can look at it.
Can you please elaborate "if i delete product drom collection ( delete tag) ".
Did you delete the product using delete button or just removed the product from collection?
So your issue is that you have a dynamic collection that including products with a tag A right?
And now you remove that A tag in a product but on that collection still showing the product.
If so, I think it just cache issue, you can also contact Shopify support if the product still there. But please make sure your site doesn't use any external apps or scripts to manage the products. On that case, you also need to re-index that external things
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