So - the game thinks your opponent has re-loaded the turn to replay it (accidentally or on purpose).
That is why it says "Security has opponent reloaded?", as a heads up that the fails counter has gone> 0.
What is the fails count in the totals screen? - it will likely be 1 or more.
Manual, "Playing by Email" secton, paragraph "PBEM Security Information".
Have a word with your opponent, and keep an eye on the fails counter from now on, in case it increases again..
Cheers
Andy