No, it is not about coflict between plugins.
I can load the direct URL with ajax=0 al the end of the link, and It looks grate:
https://digitalempresa.com/ok-utf8.jpg
https://blogs.es.amnesty.org/madrid/agenda/?orderby[0]=event_start_date&orderby[1]=event_start_time&orderby[2]=event_name&pagination=1&full=1&long_events=1&ajaxCalendar=1&mo=7&yr=2017&em_ajax=0
But using arros to next and prev, It loads with AJAX and the characters looks wrong.
https://digitalempresa.com/ajax-error.jpg
https://blogs.es.amnesty.org/madrid/agenda/
Any way to disable AJAX on Next/Prevv buttons?