Google Shopping categories changes into weird ones

First, thank you for making this plugin!

I’m trying to make the Google Product Feed part working, but can’t make all category matches stick.

If I’m in the Google / Categories tab, and for instance select the Google Shopping Category:
Apparel & Accessories > Jewelry > Bracelets
and save the changes, after the page refresh this will have changed itself to
Apparel & Accessories > Costumes & Accessories > Sport Uniforms > Baseball Uniforms

It happens all the time.

Three other categories that keeps getting changed into others are:
Apparel & Accessories > Jewelry > Rings
Arts & Entertainment > Party & Celebration > Gift Giving > Gift Cards & Certificates
Home & Garden > Decor > Seasonal & Holiday Decorations

I guess there must be a mismatch in some underlying table somewhere. Would much appreciate a fix!