My AMC and ST keep changing positions during game

[JustNEZ]

So somtimes randomly during a match my Striker and my Attacking Midfielder Centre switch positions during the game and I have to go through Tactics to sort it out. Why is this happening, and how do I stop it?
Thanks in advance

 

[Scotty98TR]

In their player instructions, in the top right section make sure they aren't set to do it

 

[JustNEZ]

Think ill have a look at that, cheers

 

[Scotty98TR]

Think ill have a look at that, cheers

I meant top-left, sorry :/