Halo 2 does not count completed levels.

Hello everyone. Recently, my friend and I decided to complete Halo 2 on Legendary difficulty. We played the campaign with skulls (like a scarab and others). After completing the game, my friend got an achievement for completing it on Legendary difficulty, but I didn’t. I thought it was a delay on the part of the Xbox servers and decided to wait. But the achievement still didn’t come, so I decided to check the game’s statistics. It showed that I had completed 4 out of 13 levels. I replayed the entire campaign, but the statistics didn’t change. I noticed that I’ve completed 4 levels on the other difficulty levels as well. For the sake of experimentation, I re‑played a couple of levels on normal difficulty without skulls. BUT NOTHING HAS CHANGED. Has anyone encountered a similar problem, or am I the only one? I would be very grateful for any help.
(English isn’t my native language. Sorry for any mistakes.)

Campaign statistics

https://preview.redd.it/msbecxiglshh1.jpg?width=1920&format=pjpg&auto=webp&s=248ea93f9cf769c83ac8f021ab33254a61190472

https://preview.redd.it/0gtb9ylilshh1.jpg?width=1920&format=pjpg&auto=webp&s=d6e9fde231b7bff5d54f781c6f68055c47246018

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u/IJPZI — 2 months ago
▲ 59 r/HaloMCC

They called me a madman...

I don't know why I did it. But I put the warthog on the scarab. I think with a little practice, it might be able to get on the wheels

u/IJPZI — 3 months ago