False postives in checks while source has plural forms

[Geeyun-JY3]

Describe the issue

It seems that checks are applied between each plural form of translation and the first plural form of the source.
It produces many false positives.

Only tested in projects whose source language is English.

I already tried

• I've read and searched the documentation.
• I've searched for similar issues in this repository.

Steps to reproduce the behavior

1. Go to a string whose source has plural forms
2. Enable some checks
3. See the false positive checks

Expected behavior

There is no false positive on string whose source has plural forms.

Screenshots

Example 1:

• Source language (English): https://hosted.weblate.org/translate/koreader/koreader/en/?checksum=3a041d774ef3f333#translations
  
• Target language 1 (Chinese (Simplified)): https://hosted.weblate.org/translate/koreader/koreader/zh_Hans/?checksum=3a041d774ef3f333#translations
  
• Target language 2 (Hungarian): https://hosted.weblate.org/translate/koreader/koreader/hu/?checksum=3a041d774ef3f333#translations
  
• Target language 3 (Moldavian): https://hosted.weblate.org/translate/koreader/koreader/ro_MD/?checksum=3a041d774ef3f333#translations
  

Example 2:

• Source language (English): https://hosted.weblate.org/translate/liberapay/core/en/?checksum=a947b1502cd1e4d6#translations
  
• Target language 1 (Chinese (Simplified)): https://hosted.weblate.org/translate/liberapay/core/zh_Hans/?checksum=a947b1502cd1e4d6#translations
  
• For comparison (The check seems to work fine here)
  Target language 2 (French): https://hosted.weblate.org/translate/liberapay/core/fr/?checksum=a947b1502cd1e4d6#translations
  

Exception traceback

No response

How do you run Weblate?

weblate.org service

Weblate versions

Weblate 4.15-dev (weblate-4.14.2-141-gc035e6ec60)

Weblate deploy checks

No response

Additional context

No response

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