I sold a player who was in the squad as a substitute, say "S7", and then bought a new player who became "RES" BUT the "S7" slot disappeared.
The problem resolved itself: (I'm not certain how but it appeared to happen) When I bought a new player.

Alas I recently sold a player who was in the squad as a substitute, this time "S2", and then bought a new player who became "RES" BUT the "S2" slot disappeared. Image attached.

Click image for larger version.  Name: Lost-Substitute_24Oct2016.jpg  Views: 39  Size: 51.2 KB  ID: 72561

Back playing the game after a break. I appreciate the effort into the new versions especially the game play. This unfortunately is ket down by the use of higher quality images in 2016 and 2017 versions i.e slow upload times and long times between menu changes.

[I use a Motorola Mobile but have also found the same error when I login via facebook]