Text cursor won't move

I am using InDesign 18.2.1, updated today, on Windows 10 platform.  I have been using the software for 5 years to produce a small magazine. I have placed a story which runs to 30 pages but the text cursor will not move past a particular sentence (which I will call the 'stick-point').  The story is composed of entries from a database and consist of index entries, place names and addreses and a description. The text cursor sticks on a particlar entry and I cannot move past it using the mouse.  If I move the cursor using the cursor keys I can move past the stick-point but as soon as I click the mouse it jumps back to the stick-point.  I have just tried to generate an Index and the index has been placed at the stick-point, even though I had moved the text cusror to the end of the story.  BIG problem as I cannot finalise the magazine.  Never had this problem before.  Any suggestions???