Query Parameters on the home page /?-1= after upgrade to 8.1.4

[stevell]

I recently upgraded to 8.1.4 and I noticed there are some query parameters on the end of the url. https://www.downunderwear.co.nz/?-1=

They also appear on the contact-us and new-products pages but no others that I can see.

It prevents the search working as rewrites any search query to https://www.downunderwear.co.nz/search?-1=

I have tried working through the no prestashop modules disabling them but I cannot find the source of the query parameters.

Any ideas how I can track where the query parameters are generated from? 

Thanks 

Steve

[stevell]

After many hours and disabling every module without any improvement I found the solution. It was quite simple. I reset the Pretty URLS module and the issue went away.

Regards

Steve