Strange glitch with files in the network share

Question

System administration

Good afternoon!
The situation is as follows:
There is a windows server 2008R2 (in the working group), accounting software is installed there. People connect there via RDP, work with it, upload it to a file. The file is uploaded to the local disk of this server, which is connected to the clients as a network drive (\\IPaddress\d$ )
Sometimes a strange situation arises - the upload is completed, the file is visible on the server itself, but it is not on the clients! The file is not large, 3-4 KB, so if it is unloaded, then it is unloaded.
On clients (seven and maybe XP, it will be necessary to clarify) this file in the connected folder becomes visible after 5-10 minutes ... The glitch is floating, it was not possible to achieve a clear repetition. Accountants have already come to terms with such a glitch, but still sometimes they start to torment me about “why so” :)
This is such a weird glitch. Has anyone encountered anything similar?