Some menu links are messed up after users complete their registration or I modify my website


Please whenever my users complete their registration, or I modify my website, some of my menu links mess up by showing the same blog link. I have to re-save the menus in other to get the links working again. I have consulted with a lot of professional. And they think it has to do with a faulty plugin. But none have been able to resolve it. Please help!

Examples of the links that mess up are: