Permissions error within small Windows 10 network

Hi - I've setup a small network at an office and for some reason, I'm having some permissions issues that someone may be able to help with. So we have 2 users (user1 and user2) both using Windows 10 Pro, and we also have a Windows 10 Pro pc setup as the server, simply to share docs etc. I setup both users on the server with their passwords theyre using on their PCs. I've also setup a "public" folder which both can access from their PCs. User1 had the data on her PC that was going to be accessible by everyone, so I moved the data from her PC to the public folder, and both users were able to access everything. This morning, User2 created a folder that he placed into the public folder, but for some reason, User1 is unable to access it, when she clicks on it, she gets that typical permissions error "unable to access....please contact administrator". If I go onto the server, and check the permissions of that folder, it shows "everyone" has full control. Yet, when I go back to user1's computer to try to access this folder (and ONLY this folder in the public folder-every other folder opens fine) she gets the permissions error. The only difference between this folder and the rest is that user2 created this folder on the server. Any suggestions on how to fix, or why this is happening would be greatly appreciated.