fixed two bugs of recent issue

[FoggyDawn]

on issue 155 and 156
tested on XCorpus dataset
AnnotationModel bug illustrative example
emma-2.0.5312
CHA bug illustrative example
aoi-2.8.1

[github-actions]

All contributors have signed the CLA ✍️ ✅
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[FoggyDawn]

I have read the CLA Document and I hereby sign the CLA

[zhangt2333]

Hi, @FoggyDawn

Thanks for the contribution! To help with review and maintenance, could you please:

1. Split into smaller PRs - This covers quite a lot of changes. Smaller, focused PRs are easier to review and merge.

2. Add unit tests if possible - Please include tests that demonstrate the original bug/issue and verify your fix resolves it.

3. Use minimal changes if possible - If this is a bug fix, let's use the smallest possible fix.

Happy to discuss the approach or help prioritize which parts to tackle first.

Thanks!

[FoggyDawn]

Hi, @FoggyDawn

Thanks for the contribution! To help with review and maintenance, could you please:

1. Split into smaller PRs - This covers quite a lot of changes. Smaller, focused PRs are easier to review and merge.
2. Add unit tests if possible - Please include tests that demonstrate the original bug/issue and verify your fix resolves it.
3. Use minimal changes if possible - If this is a bug fix, let's use the smallest possible fix.

Happy to discuss the approach or help prioritize which parts to tackle first.

Thanks!

sorry， I didn't notice that further commits in my fork would influence pull request. I will try to figure that out and clean commits for my own project

[FoggyDawn]

I will open two new pull request later, with only a few changes involving only one file each.

[FoggyDawn]

new pull request updated