I had the same in my Sporting Lisbon game.
2 Forwards:
SC Chilikov (Towering Target Man) closer to the left
FC Djalo closer to the right.
Use TM ticked ON.
At some point I decided to swap their positions but Chilikov was still as TM.
Since then my team played many balls to Djalo as he was now closer to the left. He wasnt too good in the air so I tried few changes but first ticked OFF Use TM instruction (but left Chilikov on the TM list). None of them got too many balls so after few games I ticked Use TM instruction back ON and everything got back to normal.
Try this but I cant promise it will work.
Maybe Im wrong but I guess my team was so used to playing to LFC that they didnt seem to notice my TTM was not there anymore