Thank you for your post.
Unfortunately, it's difficult to determine a solution without seeing the file. However, since the file is displaying properly on most of the machines, there is obviously something different on these two machines.
Are these machines running under Mac OS or Windows? Or, is one one Mac OS and another on Windows?
What version(s) of the OS is running?
Is this database file being shared? Or, does each person have their own local copy?
Any other information you can provide, even if you think it is irrelevant, may be helpful in narrowing down the possible causes.