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the issue with Tigra CSS, they make cover "not responsive"
here the Tigra CSS:
/components/com_community/templates/tigra/tigra/assets/css/tigra.css
body div#community-wrap div.js-focus-cover > img.cover-image, body div#community-wrap div.js-focus-cover img.cover-image {
bottom: auto !important;
height: 340px !important;
max-height: 340px !important;
min-height: 340px !important;
min-width: 100% !important;
position: absolute !important;
top: 0 !important;
width: auto !important;
}
please contact template provider for more support. Tigra as 3rd party template, and they always override jomsocial default template and make lots of issue.
even I select default template, the tigra CSS still loaded.
I suggest you to rename:
/components/com_community/templates/tigra to other, after that set default template.