Click on image with Lightbox gives differing response

Normally when I click on an Image and LIghtBox is ticked the image is displayed in the centre of the screen - see image2. But other times it is displayed on the top left of the screen see image1. I don't know what setting controls this.
Can you help please?

 

Thanks, when I access this again I cannot reproduce the problem. I will keep your idea in mind if it occurs again. Thanks.

 

I did get an error later - here is the message - I'm not sure what it means. Please could you advise. Thanks

 

When I point at frontend.min.js I don't see any message.

The original error message says "Cannot use an Import statement outside a module".

I had these posts in another website, and I exported them and imported them into this website. I wonder if this is causing the problem?

 

Reflections from the Pew 66 - Forthview Church
This is unedited - when I click on the image I get a link to the Scottish Churches Trust website - the link field in the module is empty - so don't know why.

Reflections from the Pew 67 - Forthview Church

This is the original post where I found the problem, I deleted the image and text and recreated them, they now work correctly (but I haven't made the layout exactly the same). I ticked the lightbox field.

 

Thank you. I hadn't realised it was the text - I must have set it by accident - and then copied that module to lots of places!.
Not sure about the original problem.
Thanks again.