In several MediaWiki projects, when you enter edit mode (non-visual), and you type control+enter (which is in several websites the shortkey for 'save'/'send' - including phabricator), you switch to international phonetic alphabet. A tiny box in the lower right tells you this, but that is easily overlooked.
A different shortkey would be preferable perhaps, it is quite hard to understand the problem once you run into this.
The issue seems to play at least at en.wikivoyage and not at es.wikipedia (I've seen it elsewhere too, but can't reproduce where).