Stripping chars / Converting chars in URLs

Similar problem to this post:

https://www.ads-software.com/support/topic/stripping-chars-converting-chars-in-urls/

When we place an external URL that has:
https://goruck.go2cloud.org/aff_c?offer_id=16&aff_id=2805&url=https%3A%2F%2Fwww.goruck.com%2Fproducts%2Frucker%3Futm_content%3D{offer_name}%26utm_campaign%3D{affiliate_name}%26transaction_id%3D{transaction_id}

The saved URL becomes:
https://goruck.go2cloud.org/aff_c?offer_id=16&aff_id=2805&url=httpswww.goruck.comproductsruckerutm_content{offer_name}utm_campaign{affiliate_name}transaction_id{transaction_id}

This is breaking the functionality of the link, so it appears its either stripping chars or converting them.

If we use the first URL in the default external product in WooCommerce, they save correctly and the link works.

I tried installing the dev plugin linked to github mentioned in the other post but it did not fix the problem for me.

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