Web resolutions (looking for advice)

Hello, I have designed a landing page in Figma in 4 sizes — 1920x1080, 1366x768, 1024x768 and 360x800.

After sending it to our developer I’ve checked ready made landing page online and it looked a bit messy (not how I expected).

For example, we have 1920x1080. On m MacBook is 16 inch (1792х1120) page looked different (then what I previewed in Figma — Fit width).

Furthermore, website looked messy also on my iPhone 16 Pro Max. For example some info moved to the right side (was aligned to left side).

My dev told me that I have to come up with more screen resolution to fix this mess. Is it true or he’s just doing something wrong? Pls tell me)

He told me that I need to more sizes — 320, 475, 640, 900, 1200.

Looking for your opinion. Thanks!