Error - Discount in all shop

[davilro]

Hello,

I have a problem in my shop that appeared today alone. I hope somebody can help me.

Suddenly a discount appeared in all products of my shop. It doesn't care about the category o group of users. This discount appears on Front and Backend but if you see the product detail the final price is ok. You can see on the attached images. I don't have any specific price and the discount change on different products. It is not always a 66.66%.
I don't know why this this discount appeared to all shop. I don't have any coupon or any rule to the catalog. 

My PrestaShop version is 1.6.1.15. I tried to update to the last version (.24) and the issue persist. It is like if somebody applied a discount to all shop, but in a part that I can not take out.

I was reviewing on PHPMyAdmin and I didn't see anything strange. 

In the last few days I didn't make any changes to the code or the database, so I don't think it's a code problem.
What do you think?

Thank you
Regards,
Daniel

Edited September 25, 2019 by davilro (see edit history)