Hello! I continued ep19 from my ep 18 save and throughout the play I noticed that at times a pokemon in the shared box will transform into another pokemon that I have.
For example, I had one gardevoir in the party and a different (shiny) one in the shared box among other pokemon (I had about 25 pokemon in the shared box. Some time through the play when I wanted to withdraw alolan ninetales, it wasn't in the shared box. In the box however was gardevoir with the moveset of my gardevoir in the party but the level of the alolan ninetales.
The same way I lost a Flygon, Magnezone and Arcanine (from officer jacob), as they transformed into Heracross, Togekiss etc. I have been using only one savefile so I just removed everything from shared box to like box 45 to avoid problems, but I think this needs to be noticed.
If this was already asked and answered, I apologize. But as far as I saw, there were only questions about shared box deleting entire box, not replacing pokemon with copies of others.