**Steps to replicate the issue** (include links if applicable):
* Log in on Android device A (with active reading list sync)
* Have a set of reading lists with articles inside them on Android device A
* Buy a new phone (馃槈) / Switch to Android device B
* Log in on Android device B
**What happens?**:
* An article in the exact same language and list appear as duplicates (and triplicates or more)
**What should have happened instead?**:
* An article in the exact same language and list should only appear once
* Limit lists to only show one article if it鈥檚 the exact same one to avoid duplicates
**Software version** (skip for WMF-hosted wikis like Wikipedia):
* Latest Android version
**Other information** (browser name/version, screenshots, etc.):
@Pginer-WMF could you provide a screenshot here? Thanks!
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//Task derived from @Pginer-WMF鈥檚 and @scblr鈥檚 personal experience//