Nextcloud client (windows desktop) strange message on startup

Hi everybody… excuse me for my bad english… i’m from italy…
On system startup (windows 10 PC) nextcloud give me a notification about “new version available”…
I upgraded to the latest version , then info box (about) say es. “nextcloud 3.1.1” … Ok … update seems to be OK.
However, at the next reboot, i have again the same notification (system fixed at 2.5.1 version)…
this has happened with every update made after version 2.5.1 …
how can i solve this situation?
Thanks to everybody
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Here the popup on windows 10 startup
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i need help… nobody ???