Substance painter not accepting on of my texture set

[Théo217859573avi]

Hello everyone!
I've been adding new components and texture sets to my project. 
Everything worked fine except for on the new texture set: while it's supposed to be on UDIM 1001 and 1002, and has a mat ID on it, it does not show up as two different UDIM tiles in my texture set list. Actually, it does not even show as multiple UDIMs. I just added 5 new texture sets with the regular way of doing and only one didn't work.
Any clues why please? 
I'm joining some pictures so that you can have a better look at it! 
Thanks a lot in advance! 🙂