Did any other software besides PM 4.6.x modify these files prior to uploading?
No, both were uploaded at the same time after make a Save As from PM itself.. just changed resolution in both pictures, anything was written after, in the other hand the software which runs my web gallery doesn`t understand unicode just latin1 western european, such as I set up in the PM iptc preferences, so, nothing written in uincode will works, also both pictures display the text correctly when opened into PM, the problem appears just once uploaded, and it seems just stationary Pad issue due that the issue doesn't happens when I write the info doing clcik in the thumbnail button info.
If the stationary pad is changing the info to unicode somewhere, then, there is the problem.