Multi product page title problem.

Hi,
In the file page.php on line 17 is the following code:

<header><h1><?php the_title(); ?></h1></header>

In a single product page it shows the TITLE of the product. Correct, Perfect!

But in a multiple product page the TITLE shows the word ‘Category, ‘ (Category with comma) followed the category name of the products.

When I change the code to:
<header><h1><?php single_cat_title(); ?></h1></header>

then in a multiple product page the problem is solved and it shows only the category of the product (no more comma and not the word: category)

but:
in the single product page the title is gone.

I use the theme pilot fish together with ThePressCart.

What can I do? It is very important to me to solve this problem!

https://wordpress.org/plugins/thecartpress/