Product Variation caching problem?!

I don't know if I got the right title. I have a shop and I want to edit my product variation, as normal, change text or whatever. Then I save the product and want to view it on the front end it sends me straight to my front page. This only happens when changing product variations.
I think it redirects me. I haven't figured out how to stop it from doing this.
Do you have any idea what I'm doing wrong?

I installed w3 total cache, wp fastest cache but the problem doesn't solve.

I don't know how to call this problem, so it's kinda hard to google. Could you please help me?

best wishes,
marlene