The ppt file mentioned below can be found in files.zip (6.6 MB)
We used Slides version 18.5 (Java version) and now we have upgraded to 18.9.
We also tried with aspose.slide 18.11 but the result is wrong too (see anfh_metiers_18_9.pdf (9.0 MB)).
The screenshot shows the problem : screenshot.png (865.9 KB)
Can you look at these files and give us your solution ?