Zend certified PHP/Magento developer

EMERGENCY: Everything on our Magento 1.9.4 is all of a sudden discounted by 19% exactly!

Magento 1.9.4
Smartwave Porto

We never ever never had this problem. All of a sudden – ALL of our products on our Magento 1.9.4 website are discounted by exactly 19%. This is a huge problem for us! I looked around the Admin panel and products themselves but I cannot find where this is coming from! There is also a tab called ‘Daily Deal’ but in the settings it says: Enable Daily Deal = NO.

How can I find out what is causing this and how can I switch it back?

There was 1172 records found in the Daily Deal -> Manage Deals – I deleted them all, flushed Cache and reindexed but it didn’t help.

I also deleted EVERYTHING from Promotions -> Catalog Price Rules

There were 1607 records found in:

Promotions -> Shopping Cart Price Rules

they have an ID (such as 2048), Rule Name: usually something like Alert #6072. Coupon Code (such as 603015BCE252D) and Expiry date and Website. I think this has to do with the Abandoned Cart extension we have from Amasty. These cannot be deleted en masse but most of them have just 5% discount defined in the Actions.

I have disabled the (Daily Deal) Magegiant_Dailydeal extension in:

System -> Configuration -> Advanced --> Advanced but it did not help.

Can I disable something else here to stop the 19% discount?

It looks like this on the front end:

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