My mail disappeared!

I have a mail server running cPanel and if I log in with webmail, i can see that the inbox contains tens of thousands of messages.

I have seen those messages correctly on mailspring before, but since today i only see like 18 last messages.
How can i see all the messages in the inbox?
if i search for an old message, it will show up in the search results, but in the normal view it is hidden.

Any way to get this working???

I have a similar problem. Thunderbird & Webmail show 8 messages in my inbox, Mailspring shows 3 of them. Bizarre. Keeping it running doesnt solve the problem. Anyone?