The way server syncing works is different on a PC than on a Mac. On the PC the file is saved on the server then synced to the offline folder on the PC, on the MAC it is the exact opposite, the file is saved locally then eventually synced to the server. This means a file created on the PC will be available in the share immediatly, but when created on the Mac it won't show up until the Mac syncs. We run into this issue all the time (We have Windows servers and mostly mac clients).
Check out the sync settings (System Preferences -> Users and Groups -> Mobile Account: Settings), from there you can set the interval for syncing, and what is synced. Keep in mind that the system won't sync open documents, and will throw up an error when it tries.