Correct duplicate discoveries bug in List

[SarahHCode]

Describe the bug
The first 50 items in List page are duplicated when accessing List page for the first time after opening app.

To Reproduce
Steps to reproduce the behavior:

1. Go to List page
2. Scroll down to see duplicates.
3. See error.

Expected behavior
Items not supposed to be duplicated in List.

Screenshots
Example:
At the beginning of list:

Duplicates later:

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.