неадекватный total при пагинации springboot

при различных параметрах size получаю разный total.

при size > количество элементов, total верный

при size <= количество элементов, total неверный

public GenericPage<FilterUserDto> getAllUserIds(@RequestParam(value = "fullTextQuery", required = false) String fullTextQuery,
                                                @ApiIgnore Pageable pageable) {
    Page<FilterUserDto> allUserIds = statisticsService.getAllUserIds(fullTextQuery, pageable);
    return new GenericPage<>(allUserIds.getContent(), allUserIds.getTotalElements());
}

верный тотал:

tasks/background/orgs/allUserIds?size=13
{"id":"JTC_SergeySV2_AdminDBO2","name":"JTC_SergeySV2_AdminDBO2"},{"id":"cf981379-68ed-42b0-b283-c733af367c6a","name":"system"}],"total":12}

неверный тотал:

tasks/background/orgs/allUserIds?size=12
{"id":"JTC_SergeySV2_AdminDBO2","name":"JTC_SergeySV2_AdminDBO2"},{"id":"cf981379-68ed-42b0-b283-c733af367c6a","name":"system"}],"total":2914}

сервис:

public Page<FilterUserDto> getAllUserIds(String fullTextQuery, Pageable pageable) {
    return taskRepository.getTaskUsers(formatFullTextQuery(fullTextQuery), pageable)
            .map(u -> new FilterUserDto(u.getId(), u.getName()));
}

репозиторий:

@Query(" SELECT distinct t.user " +
        " FROM Task t " +
        " WHERE :fullTextQuery is null or UPPER(t.user.name) like :fullTextQuery" +
        " order by t.user.name")
Page<User> getTaskUsers(@Param("fullTextQuery") String fullTextQuery, Pageable pageable);