As the title says usage spikes to 100% after I try putting it into a markdown card and I'm getting flooded with the following error message which looks to reference another markdown card. Each individual component seems to work though.

Here's the error

2020-05-22 13:11:54 ERROR (MainThread) [homeassistant.components.websocket_api.http.connection.140097946640080] Error handling message: invalid template (TemplateSyntaxError: unexpected '%') for dictionary value @ data['template']. Got "{{ {% if as_timestamp(state_attr('calendar.va', 'start_time')) |timestamp_custom('%d') }} |int==now().day and\n{{ as_timestamp(state_attr('calendar.va', 'start_time')) |timestamp_custom('%m') }} |int==now().month %}\n              Today at: {{ as_timestamp(state_attr('calendar.va', 'start_time')) |timestamp_custom('%-I:%M %p') }}\n            {% else %}\n              Last Ran: {{ as_timestamp(state_attr('automation.vacuum_start', 'last_triggered')) |timestamp_custom('%b %d %-I:%M %p') }}\n ...

and here's my template code.

{% if as_timestamp(state_attr('calendar.va', 'start_time')) |timestamp_custom('%d') |int==now().day and
   as_timestamp(state_attr('calendar.va', 'start_time')) |timestamp_custom('%m') |int==now().month %}
Today at: {{ as_timestamp(state_attr('calendar.va', 'start_time')) |timestamp_custom('%-I:%M %p') }}
{% elif as_timestamp(state_attr('calendar.va', 'start_time')) |timestamp_custom('%d') |int-1==now().day and
 as_timestamp(state_attr('calendar.va', 'start_time')) |timestamp_custom('%m') |int==now().month %}
Tommorow at: {{ as_timestamp(state_attr('calendar.va', 'start_time')) |timestamp_custom('%-I:%M %p') }}
{% else %}
{ as_timestamp(state_attr('calendar.va', 'start_time')) |timestamp_custom('%b %d at %-I:%M %p') }}
{% endif %}

and the other markdown template code.

{% if as_timestamp(state_attr('automation.vacuum_start', 'last_triggered')) |timestamp_custom('%d') |int==now().day and
as_timestamp(state_attr('automation.vacuum_start', 'last_triggered')) |timestamp_custom('%m') |int==now().month %}
              Last Ran: Today at {{ as_timestamp(state_attr('automation.vacuum_start', 'last_triggered')) |timestamp_custom('%-I:%M %p') }}
            {% else %}
              Last Ran: {{ as_timestamp(state_attr('automation.vacuum_start', 'last_triggered')) |timestamp_custom('%b %d %-I:%M %p') }}
            {% endif %}