@mariagephoto,
All your issues are related, follow this issue one by one.

1. switch to the template that provides a wider column.
2. change the columns to the desired number (3), it will not display correctly becasuse issue #3.
3. you have 3 options here.
– contact the theme developer for fixes
– switch to a different theme
– contact our support team ([email protected]) for a quote to fix the issue.
4. Fixing issues above will fix this issue.
5. Create a new price list and assign new price list or if you contact our support team they may fix the issue for you