Why are my strings not being printed correctly?

Question

I want to write a piece of code to create a list of random potions for D&D 5e from a few given parameter lists. And I was almost done, every bit of code working properly apart from a single line of code.

I expect an output of this sort: "The liquid is: Yellow with flecks of colour.". Instead, I get this: " with flecks of colour.". Basically, the entire part with: "The liquid is: " gets omitted. Weirdly enough it works fine in one single case, when the colour is "Dark Red".

Here is the minimal working example:

#include <iostream>
#include <vector>
#include <string>
#include <random>
#include <fstream>
#include <sstream>

int main(int argc, char** argv)
{
    std::vector<std::string> appearance;
    std::vector<std::string> appearance_2;
   
    std::ifstream d_appearance("appearance.txt");//20 entries
    std::ifstream d_appearance_2("appearance_2.txt");//20 entries

    std::string line;
    std::string line_2;

    for(int i = 0; i < 20; i++)
    {
        getline(d_appearance, line);
        appearance.push_back(line);

        getline(d_appearance_2, line_2);
        appearance_2.push_back(line_2);
    }

    std::random_device generator;
    std::uniform_int_distribution<int> twenty_dis(0,19);

    std::string p_appearance = appearance[twenty_dis(generator)];
    std::string p_appearance_2 = appearance_2[twenty_dis(generator)];

    for(int i = 0; i < 1; i++)
    {
        std::ostringstream s_look;
        s_look << "The liquid is; " << p_appearance << " with " << p_appearance_2;
        std::string look = s_look.str();
        std::cout << look << std::endl;
        std::cout << std::endl;
    }
    return 0;
}

I hope it's ok if I just put the text files here as code blocks: Appearance

Clear
Blue
Green
Red
Pale Green
Pink
Light Blue
White
Black
Dark Grey
Light grey
Yellow
Orange
Gold
Orange
Bronze
Metallic
Purple
Brown
Dark Red

Appearance_2

flecks of colour.
swirls of colour.
fizzing bubbles.
bubbles suspended in it.
some kind of bone floating in it.
leaves and flowers in it.
two separated liquid phases.
a bright glow.
a soft glow.
stripes of colour.
translucency.
a cloudy murkiness.
blood within it.
dirt floating in it.
chunks of metal in it.
some type of gore from a slain creature.
steam coming from it.
a face in the liquid.
constantly moving and shifting liquid.
a constant heat.

Answer 1

That could be the problem with line endings. If you created the file in Windows (thus you have "\r\n" line endings) and use this file in Linux, the getline would work differently. It will use '\n' as a delimiter, but will treat '\r' as a separate string. As the result you may get some appearences equal to "\r". At the end of the day you could output that:

std::ostringstream s_look;
s_look << "The liquid is; " << "\r" << " with " << p_appearance_2;
std::string look = s_look.str();
std::cout << look << std::endl;
std::cout << std::endl;

That will override the beginning of the string, so you don't see the "The liquid is; " in the output.