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Created attachment 13931 [details]
screenshot of problem

This is caused by the mixins code for buttons having a higher specificity for the padding than:

.button.photo {
position: relative;
display: table;
margin: 0 auto;
padding-left: 44px;
text-align: left;
}

Prioritization and scheduling of this bug is tracked on Mingle card https://wikimedia.mingle.thoughtworks.com/projects/mobile/cards/1468

Created attachment 13932 [details]
screenshot of css rules in effect

This was fixed in I144129a84cc4d9c3441f548d7552cb66a1c666a1 but has not been deployed to enwiki (I assume this is where you saw the problem)