I played with 2 STs and at 25' I got red card.. So I subed my ST with a DC, and moved the new player to Dc position.

LaManiaque, yes you are correct. I could see my ST playing in Dc position till the end, although the commentary and overview showed that sub was made.

The bug is clear.
The unclear part is if the live match displayed wrong players or the substitution was never made which is pretty bad.

I guess with manager ID and the game info Nordeus can found the game and check, so I will raise a ticket to them.