первую форму
<form action="{'16' | url}" method="get" class="selection__form" id="mse2_filters">
{$filters}
<button class="button button--primary button--circle button--md" type="submit">Подобрать</button>
</form>
вторую форму
<form action="{'15' | url}" method="get" class="selection__form" id="mse2_filters">
{$filters}
<button class="button button--primary button--circle button--md" type="submit">Подобрать</button>
</form>