strange: blank page at first call - reload needed

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Hi , often at first access the body of the page is blank (frames around are ok); I just need to hit the 'reload' button of my browser (Firefox) and the articles are shown normally. For a normal use, the body of the page should display already filled (like on others wikis). My be a prblem of cache on the server => Is there a way to force the emission of the body of the page ? I join image of what is filled and what is missing, at first access of the url :

17:43, 7 August 2019

Ce bug est connu et est surement du à la collision entre une vielle et une nouvelle version de jquery :(

Il va falloir que j'essaye de la déboguer et voir si ce n'est pas un bug dans une bibliothèque de MediaWiki.

22:24, 7 August 2019