Camera Raw presets disappear

[laurabfernandezfotografia]

I purchased some ACR presets and copied them in the same folder where I got the rest of the ACR presets. When I first open Ps, ACR shows them but after going to Photoshop (I previous use ACR adjustments then open Ps) I open the file as a smart object and whenever I come back to the ACR filter the new presets disppear! The rest of them are there but not the new ones. I tried to delete them from the Adobe settings folder and launch them again, but to no avail. The owner of the presets told me it has never happened ans she´s already curious as to what could happen. I have the latest version of Ps and ACR. Tried with the 2020 version just in case, but it happens again! 

Someone please can help me?

[TheDigitalDog]

Do you know where on your hard drive the presets reside? Have you tried importing them using the contextual menu below?