I am not an expert with Algolia (yet) - but in order for this question to be answered, we will need to know I little bit more information, including…
- What type of implementation you are using (autocomplete, instant search, custom)
- What is your ranking formula?
If you show 10 results, and the ranking formula has the title first, it will show the first 10 results using title before searching the description, since you have chosen to rank title before the description. Changing your Ranking Formula will certainly modify the results, maybe try to use Description as the #1, or #2 priroty in your ranking.