Email body is missing in Client

We use as commercial users eM Client Pro (version 9) with IMAP access (the emails of the problematic account appear in 4 computer, there are 2 which have eM Client program)
I don’t know why - but somethimes there are emails which body is missing, but in other computer we see that there is contain. I have read the other topics with same problems but I didn’t find the answer. I don’t find Repair exe in the folder or in the program.

Could you please help how can we fix this problem?