unfortunately I cannot comment yet, so I will ask here. Did you stage the changes of the map inside your commit? Even if Sourcetree is marking your files as modified (checked-in) you still have to add your file inside your commit (aka stage the modified file). Also after you commit some changes, you need to push them to the remote (usually origin). A complete workflow would look like this:

• Make sure your file is tracked/ added
• Change your file
• Save it
• Add to staging area
• Write your commit message
• Commit locally
• Push to remote

Others have to fetch the origin and pull to get your changes. If this does not solve your problem, please do share a photo of the commit itself, so we can see what's going on.

Remember to stage the changes of the map inside your commit 

Even if Sourcetree is marking your files as modified (checked-in) you still have to add your file inside your commit (aka stage the modified file).

Also after you commit some changes, you need to push them to the remote (usually origin).

A complete workflow would look like this:

• Make sure your file is tracked/ added
• Change your file
• Save it
• Add to staging area
• Write your commit message
• Commit locally
• Push to remote

Others have to fetch the origin and pull to get your changes.

If this does not solve your problem, please do share a photo of the commit itself, so we can see what's going on.