Pages have multiplied on navigation bar

Hello,

Recently, I logged on to my website and found that my navigation bar was displaying a triplicate of the same information under Pages.

I hadn’t done anything. Someone suggested that it could be a plugin problem and that I should deactive and then reactive and update, in order to identify which plugin may be the cause.

I have done this i.e., deactivated and then reactived – saved – each plugin individually and received confirmation that all plugins had been updated.

However, even when all the plugins are deactivated the problem persists.

Thanks. Any assistance will be much appreciated.