@Devjit Basu 

You‘re not alone with this problem. 
At the moment there seem to be problems with updating personalized playlists and also with notifications. 
Deezer is aware of the problem and investigating it. 

@Devjit Basu 

Can you check it again?

For me today my mondey discovery mix has been updated.

Hi. Yes mine has updated. Great thank you so much. Seems to be fixed for now. 
 

Do we know if this was fixed? I am having this same issue lately, seems that my monday discovery list is always the same. At this point I have more liked songs there than new songs to discover.