Problem in viewing the inbox

Hello! I am having a problem in viewing my inbox.
Sometimes, it shows that there are emails in the inbox but when I check it then I don't see any new email.
This is a shared email account and other users also have access in it.
I have tried to change the view of the inbox folder but it worked for a while and went back to the previous setting.
Could you please explain what’s going on and how can I fix it?
Thank you.
