PRS-T2 Strange behavior when sending book to device

Latest version of Calibre 3.10 64bits used, Windows 7 and an old PRST2...

I've been using Calibre for years now on this device and since a few versions I have difficulties to transmit books to the device.

I will attach screendumps of my last problem:

• book selected in calibre and sent to device:
  
• task finishes correctly
  
• switched view to the sd card of the device
• the path and file names are correct BUT the author and title is wrong
  
• stangely this was the author and title of the last book entered in the main library on the PC
  

Any ideas?