Does the mouse work correctly in other programs?
It's not clear what you mean when clicking on a "split part of the video." Are you clicking on a clip that has been created as a result of splitting?
You say "when I zoom." That term normally refers to a zoom effect. What is being zoomed?
And when you refer to the cursor, is that the scubber (the red line) and, specifically, what is meant by a return to "the middle of the editing?"
A video of what is happening would be helpful, if you have that ability. Upload it to a free server, like Google Drive or MS OneDrive. Make the link public (shared) and post it here.