Not sure why nextLine() is using a previous line on top of the one which has just been entered.

[sick trail]

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If Scanner#nextLine reads an empty line after calling a different Scanner#next method, take a look at this StackOverflow post.

[fleet rampart]

maybe something a little more than a link would be great?

[crisp basalt]

could you send whole code in text, so we could analyse it more accurate?

[fleet rampart]

        Scanner scanner = new Scanner(System.in);
        String userInput = new String();
        userInput = scanner.nextLine();

        if(modelRecords.isEmpty()){
            System.out.print("""
        There are no model records. Returning to main menu.
        >""");
            scanner.nextLine();
            returnToMainMenu();
        }

        if(!userInput.matches("[0-9]+")){
            System.out.println("Please only input whole, valid numbers.");
            checkInpDelRecord(modelRecords);
        }
        System.out.println(userInput);
        if(Integer.parseInt(userInput) < 1 || Integer.parseInt(userInput) > modelRecords.size()){
            System.out.printf("Please input a valid record number between 1-%d.\n", modelRecords.size());
        }
        else{
            return userInput;
        }
        return "0";
    }```

thanks