Heads up: It looks like Twitter may be testing out a change on some accounts that, like Facebook, will make posts format different on screen based on their size? So short posts have a larger and bolder font. But it also breaks the display in weird ways on at least some phones.
Putting phone in landscape seems to be an annoying workaround, if you get hit with the update. Using your phone's browser to reach web Twitter might also work, though it's possible there's a similarly broken update waiting for you there.
Note that Twitter doesn't roll out changes to every account at once so "it's not happening to me" isn't useful information you need to share here.
If you get the update please tweet a screenshot at Twitter's support account because we need to kill this thing before it spreads.
