Cant edit Short Description at several products

I have 12 products in my webshop, I’m trying to add a short description to all of these products. I’m able to add a description for 9 of these.

The products it wont let me add a short description to have 860 variables.
Does anyone have a solution for me to add a short description to these bigger products?

It doesnt have a problem with me adding one to the products with ~300 variables.

Thanks in advance, let me know if you need any more information.

The broken product: https://www.doordruksetsdrukken.nl/product/doordruksets-a6-in-3-voud-gelijmd-tot-bloks/