First guess would be that you are missing the required original datafiles (or put them in the wrong location).
Can you attach/post the output of:
tree -d -I "xcom?|standard|common|mods" ~/.local/share/openxcom/ > ~/Desktop/openxcom.tree.txt
* The -I option ignores a bunch of standard folders
* The ">" construct will create a file on your desktop
* -d is there since at the moment I am only interested in the folder structure, not the files under it.
The info message about missing openxcom.png is harmless, you can safely ignore it.
P.s. Which version of openSUSE are you using? It looks like the repository provides a flatplack image (the openxcom download page provides an appimage).