A problem in the layout of https://fr.wikipedia.org/wiki/Utilisateur:Rinaku . Appears or disappears at each purge. I observed it today for the first time. The problem is that the line starting with "Après-shampooing" (first "{{Liste éléments|...}}" in the wikicode) is moved down to after the userbox group (the "handwritten" <div></div> in the wikicode). Observed in Firefox and Iron. The problem disappears when I disable HHVM.
Topic on Talk:HHVM/About
I can't confirm with FF 33 and Win8. In Chrome, I couldn't see the issue when I first looked at your page; I tried to edit it, then abandoned the changes, and when I reloaded it I could see what you meant. Now I can't replicate anymore anyway, and notice I never disabled HHVM.
Indeed; for me it happens roughly half the time with HHVM activated.
I believe that's bugzilla:72357 ("[REGRESSION]: Content not wrapped in #bodyContent and other madness like bold links etc.") which they're investigating right now. Thanks for the report :)