android not zooming

hi i’ve made a full responsive site on drupal 7
it’s a website about events… so… events grids (views) and events pages.

it’s all good on apple devices but on android phones users can’t zoom pages.. so it’s really hard to read titles of events in grids.
where do you think this issue is coming from?

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/22/feed