Order by Numeric Custom Field Value
Assuming this is in Craft 3, you should be using .orderBy() instead of .order(). Does the following work as expected?

{% set users = craft.users.group('influencer').orderBy('score desc').limit(24) %}

{% paginate users as pageInfo, pageUsers %}

{% for user in pageUsers %}
    {{ user.username }} : {{ user.score }} &lt;br&gt;
{% endfor %}


Here it is in the docs: https://docs.craftcms.com/v3/dev/element-queries/user-queries.html#orderby

Also turn on devMode to be sure that no errors are being suppressed.