Show until date

Hello,
We have a strange phenomenon on the date value "Show until" in the planning option display.
Despite all the settings tried, each time when you connect, the box "save the date" is checked with always on the same date in until date.

Even if we change the date, the old value still comes back !!
Do you have an idea or a tip? this only happens for one person !!

Thanks
Regards,

 

Yes I tried, if i check "show whole project" it works.
But , whenI uncheck it automatically resets and always with same old date !!