WordPress WP-Admin "sleeps"

I’ve lot of issues when I’m working on my WP-ADMIN panel. It’s a long-time problem, but now i want to ask some help here cause my php developer seems to be unable to find the solution.

It’s not easy to explain, but when i do modifications on my panel, it’s like cached, or sometimes I have to repeat 2-3 time the same thing.

Ex:
i add a text widget, i put a code inside, i click on refresh, then i check on the site and i cannot see the widget. I go back in the wp-admin, and i cannot see the code that i inserted before.

Ex2:
I sticky a post, and i publish as sticky, but when i’m in the main article list page i see it “unsticky” sometimes with “missed schedule” even if it was scheduled for the day after. I click on refresh page, and i see it “sticky” and without the “missed schedule”

Ex3:
I activate a new plugin, but when I try to modify on the plugin panel, i receive a messagge “You don’t have the rights to modify blah blah”, i wait 5-10 minutes, and then i can change all the stuff, but sometimes i go back to the plugin panel and i see it’s still “not activated”…

It seems that the whole system doesn’t take my movements in the right way on the wp admin, and I also thing that those issue ara causing some of my “stability” problems.

Anyone can help me? It’s a problem in wp? On the DB? on the Server? Apache?
Please, i need urgently some help