It sounds like you have data base corruption. That is usually caused by making a change in one view that conflicts with that in another view. One way to sometimes fix it is to delete all the connections and start again or just start a new sketch and complete on view then move to the next view and wire that according to the rats nest lines. I usually double click on the rats nest line to route it then drag it in to the correct postion before doing the next. Component placement matters (all the pins are numbered) but Fritzing will let you make connections that cause shorts across components and it can’t always recover from that when you delete the bad connection. If it gets bad enough (usually that takes interrupting a parts update though) you need to delete the user directories to clear it but I don’t think you are there yet. Try one or the other of these suggestions and see how it goes.
Peter