help, I cannot enter 1 Kg as basic price unit

Hi, I cannot enter the number 1 for the basic price unit. I can write 2 or 3 or every other number except 1. It alway says ‘undefined’ instead of 1: Grundpreis undefined pro kg …. What can I do?

• This topic was modified 3 years, 10 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Everything else WordPress topic

The page I need help with: [log in to see the link]