[Plugin: Statcounter] Analytics code causing problems

I’m using WordPress for the first time (Gridstack theme) and my website is ready to go live. I’ve uploaded it to a test domain at https://www.hollyillustrator.co.uk and it’s working as I want it to.

I want to include both Statcounter and Google Analytics in the site so I have tried adding the code both where indicated in the theme options, and also using the Statcounter plugin. When either (or both) of these is included in the code, when viewing the pages I have to reload them to make them visible.

It seems to be only affecting the navigation menu; if I click on the logo in the top left corner, the home page appears without having to be reloaded.

I’m not a coder so any and all advice/help will be very welcome!

Thanks,
Mary