Incorrect taxonomy ID assigned to post with custom query

For anyone visiting this topic in the future, I will form an answer of my comment.

The reason for this issue was the use of $category inside the tax_query. The get_terms function return terms as entire objects by default. The tax_query expects an ID (or an array of IDs). This caused issues with the execution of the tax_query.

For anyone having the same problem, make sure your only including your term IDs. So this:

'tax_query' => array(
    array(
        'taxonomy'  => 'soort-event',
        'terms'     =>  $category,
        'field'     => 'term_id'
    )
)

Becomes this:

'tax_query' => array(
    array(
        'taxonomy'  => 'soort-event',
        'terms'     =>  array($category->term_id),
        'field'     => 'term_id'
    )
)

More about get_terms: https://developer.wordpress.org/reference/functions/get_terms/

More about tax_query: https://developer.wordpress.org/reference/classes/wp_query/#taxonomy-parameters

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