Weird behavior and hiding next steps (clickable texts)

[hamzaelbarmaki1994]

Describe the bug

hi,
i was palying an exercice of math using ruffle as player but after question 1 the exercice behave weird
doesn't shows next steps to respond the questions,

note: it plays well on the old flashplayer32 locally (i want to use the online version to share it )

Expected behavior

image speaks loud

Content Location

this is the link of swf https://bibliotheque.sesamath.net/public/voir/571

Affected platform

Online demo

Operating system

windows 10

Browser

all browsers

Additional information

even desktop version has the same problem.