Facebook pixel sync issues: prices without VAT and only some items are synced

[Gatto_Rosso]

Hello,

pixel brings only some items to Facebook catalog and price is shown without VAT.

Pixel code is inserted by the free module "Facebook Pixel Installer": all checkboxes in module configuration are set to "Yes".

In Meta Sales Manager the pixel code is recognized as data origin and no issues are reported.

Looking at website source code I see that OG microdata seem correct — but prices continue to be shown without VAT even after trying to change the value for product:pretax_price:amount to $product.price_amount in product.tpl.

Any help will be much appreciated!

PS 1.7.8.8