Hi Mikey,
As you’ve now set “Case Sensitive Search” to Yes and saved, here’s a few more things you can try (as it appears you have some JS console errors related to your theme and a few other plugins):
1) Make sure your plugins and theme are all up to date
2) Try deactivating all plugins except for Ultimate Product Catalogue then reactivate one by one
3) If the letter case issue is still occurring after this, try briefly switching to another theme (such as WordPress’ “Twenty Seventeen” theme)
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I also noticed that your shortcode points to an non-existent category ID (i.e. there is no active category with an ID of “1”), so the right side is blank when the page loads.
If this wasn’t intentional, you can find the proper ID by editing a category and using the ID number listed at the top.
For example, instead of:
[product-catalogue id='7' starting_layout='Detail' category='1']
You could use:
[product-catalogue id='9' starting_layout='Detail' category='41']
to display the “Deporte” category on page load.