ZFR: Do you exit to the main menu after saving? If yes, than that's your issue.
The best way to check is to see if there is a check mark on the campaigns you already completed. If there isn't, it means a new game was started instead of continuing.
See attached.
It doesn't matter that you played this before Restoration of Erathia or Armageddon's Blade.
F4LL3N_ED: When I save it at the end of a campaign it takes me back to the "Select A Campaign" screen with only the 4 campaigns. I have always saved it. When I open up the last save it puts a tick on, but then when I do that for the other two the ticks on the first two disappear. Here is a screen shot.
**EDIT** Trying to attach 1.1MB JPEG but when I click Post my Message the image isn't attached. Try this:
https://photos.app.goo.gl/vJh7d2Zq1LtKFbh69 Yes, you saved it. But the problem is that
after saving you closed the game and went to the main menu. Then next time you played, instead of loading that saved game you just started a New Game from the main menu. That resets your progress.
It looks like the first 2 aren't done.
So:
Load the save game that gives you the screenshot above.
Click on one of the ones without a check mark, then use cheat codes to beat it. (Press Tab, type nwcredpill and press Enter).
Do it to beat all levels.
You should be taken to a save screen. Then the campaign selection screen with a checkmark next to 3 campaigns now.
Repeat for all campaigns without a checkmark.