[Bug] Completed exercises unmarked after refreshing the page (EN/Home)

[HappyEgoiste]

Preconditions:

1. Log in as an existing user
2. Select EN from the language switch.

Steps to reproduce:

1. Go to [Speech exercises]/[Words]/[Home] (https://brainup.site/groups/4/series/9/subgroup/74)
2. Complete several exercises so that they have the green tick mark in top right corner.
3. Refresh the page with all exercises for the section.

Actual result: Completed exercises unmarked, no green tick shown.

Expected results: Completed exercises are marked with green tick.