The original article Eigenvalues and eigenvectors for which this task was filed appears fixed on mobile web but not in the app.
A similar issue of unexpected horizontal scrolling is also occurring on the Aswan Dam article on Wikipedia v2.7.239-r-2018-07-31.
In this case it appears to be related to a wide image (template:wideimage) within the article.
Original task description
The Eigenvalues and eigenvectors seems to have a lot of horizontal space in it although no content is displayed any where in that space. This makes scrolling the article a little difficult as it seems to scroll to an empty space. The source of the space is not clear, probably due to a mathematical equation.
Possibly related to the change https://gerrit.wikimedia.org/r/#/c/351840/
The issue seems to be with the row "eigenvalues" in the "Applications" section.