[Konstantinos]

In this part you don't check if "issuerid" is not equal to INVALID_PLAYER_ID:

Код:

if (actmarker[issuerid] >= 1)
{
    TextDrawShowForPlayer(issuerid, HitMarker);
    timarker = SetTimerEx("HTD", 250, true, "%d", issuerid);
}

Moreover instead of having 6 if/else if statements for checking "issuerid != INVALID_PLAYER_ID", have it once at the top and let the rest inside it (except the last part with pFirstAid).