System.out.println（）和Scanner的奇怪问题

I have a while loop that is always true that asks the user to input a letter. When a letter is inputted it is looked for in a switch statement and then a block of code is executed from the switch statement where more inputs are asked for. It seems like the outputs of the code are being registered as the input of the user in some portions of the code. Here is a brief sample of my code :I have a while loop that is always true that as