Hi! I'm going to copy and paste the problem with Ren'Py below.
**Ren'py 7.6.0 introduced a warning when loading a save that comes from a different computer, and asks you to confirm loading. You won't see this with saves made in the latest version of Tales of Onyx, but you will see this message with saves made in this version. This is why it is being said "Made on another device".
For this reason, I recommend playing new and save your new save file over the old saves.