C++ ifstream is not reading the entire line from text file - c++

Question

I'm implementing a simple program using text files. Users can register/login accounts that are saved to a txt file.
One of the options is to post a message to a "Post board" that will store the user's name followed by all their posts.
For example:
Leo: Hello
Tony: Bye
I'm able to successfully read the text file and output the message to the console but the username is not displaying, only the message.
For refrence I have a postMessage() function that uses getline() to concatante the username using
ofstream << getUsername() + ": " + string::message.
I have quite a bit of code so I cannot share all of it, however, here are the pieces in question.
public:
char postMessage(User& currentUser, bool loggedIn) { //Will post a message to the board. Passes a User object.
if (loggedIn == false) {
std::cout << "You must be logged in to post!" << std::endl;
userLoginRegisterPrompt();
return 0;
}
char messageState; //Code to verify if message was posted.
std::string message; //Actual message string
std::cout << "Enter your text: " << std::endl;
std::cin.ignore(); //Clears string buffer.
getline(std::cin,message);
std::ofstream post("C:/Users/19097/Desktop/Programs/Registration/Registration/UserPosts/-Posts.txt", std::ios::app); //File with user posts.
post << currentUser.getUserName() << ": " << message << std::endl;
logAction(currentUser.getUserID(), "Made a post");
}
Here is the loadPosts() method to read from the text file and display it to console.
static bool loadPosts() { //Will be for viewing the post history.
std::ifstream post("C:/Users/19097/Desktop/Programs/Registration/Registration/UserPosts/-Posts.txt");
std::string line;
if (!post) {
std::cout << "No board exists!" << std::endl;
return false;
}
while (post >> line) {
getline(post, line);
std::cout << line << std::endl;
}
}
This is what some of the posts read like in the actual txt file.
This is what shows on the console when using loadPosts()