OpenGL Transparent textures overlapping/blending issue - c++

Question

I'm making a simple 2D game using OpenGL 4.6 in C++. I've currently got both depth testing and blending enabled, where I've been able to render my transparent textures properly. However, when I move one texture to the point that it overlaps another texture, the transparent pixels overlap the texture underneath as well. All my vertices have a z depth value of 0.0f. Would it be better to just disable depth testing? If not, how can I resolve this?
Initial:
Overlap:
Main.cpp:
// Initialize application
GLFWwindow *window = init();
if (!window)
return -1;
// Settings
cout << "OpenGL Version: " << glGetString(GL_VERSION) << endl;
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
// Entities
GameUI gameUI;
glfwSetWindowUserPointer(window, &gameUI);
glm::mat4 Projection {glm::ortho(0.0f, 1280.0f, 0.0f, 720.0f, 0.0f, 1.0f)};
glm::mat4 View {glm::translate(glm::mat4(1.0f), glm::vec3(0, 0, 0))};
glm::vec3 translationA {glm::vec3(0, 0, 0)};
glm::mat4 Model = glm::translate(glm::mat4(1.0f), translationA);
glm::mat4 mvp = Projection * View * Model;
Shader shader {"shader/vertex.vert", "shader/fragment.frag"};
shader.bind();
shader.setUniformMat4f("MVP", mvp);
int sampler[] {0, 1, 2};
shader.setUniform1iv("v_Textures", sampler, 3);
// MAIN LOOP //
while (glfwWindowShouldClose(window) == 0) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// glClear(GL_COLOR_BUFFER_BIT);
gameUI.update();
gameUI.draw();
glfwSwapBuffers(window);
glfwPollEvents();
// cout << glGetError() << endl;
}
Vertex Shader:
#version 460 core
layout(location = 0) in vec3 position;
layout(location = 1) in vec2 texCoord;
layout(location = 2) in float texIndex;
out vec2 v_TexCoord;
out float v_TexIndex;
uniform mat4 MVP;
void main() {
gl_Position = MVP * vec4(position, 1.0);
v_TexCoord = texCoord;
v_TexIndex = texIndex;
}
Fragment Shader:
#version 460 core
in vec2 v_TexCoord;
in float v_TexIndex;
uniform sampler2D v_Textures[3];
void main() {
gl_FragColor = texture(v_Textures[int(v_TexIndex)], v_TexCoord);
}