My weft extensions keep falling out.

My sew in extensions keep coming out almost immediately. For context: I got extensions for the first time 2 weeks ago. After 3 days they were completely falling out of my head and bothering me. I thought they were installed incorrectly, so I went to another stylist who confirmed they were not installed right and did a reinstall for me.

Literally 3 days later, my bottom row came untied and I had to completely take it out since half of it was falling off. The next day, my top row is already coming loose. The first 2 pics are what they look like right now, and the 3rd is how they initially looked.

I don’t know why I keep having problems, I’m following everything they told me and taking great care, using the right products, not brushing too harshly.

Is it just that I have very fine hair and it can’t hold? I’m so confused. Let me know your thoughts