Can I ask, are you using Gravity forms Woocommerce Product Add-ons?
What I did was I had some products working and some not. I opened one of each. I performed the action (in my case trying to add a product to cart) on each, (so one was successful, one not). Then left-clicking in Chrome I got the page source for each.
The thing is that when Gravity is performing with a wooproduct it’s validation and error messages don’t show, they are hidden but you can see where they are in the code.
Then I found the part of the code that pertained to the error - in this case the part loading gravity forms - copied that out for each (colour coded so I wouldn’t get confused) and put them into an online tool to compare them and search for the differences. And trawled through them till I found the hidden error message and what was different between them - didn’t take as long as I thought, it was near the top of the GF code. That told me where to look, what section of my form.
When I went to the form I found that on the faulty product the section had a greyed out options box - it was the product head part that you put in with the gf woo product add-on. Don’t know how it happened, it was fine previously but it had - some upgrade or something. So I replaced that to an exact replica of the working one and everything was fine.
You could also have your conditional logic entries a bit wrong. What I would be looking for is if maybe you’ve moved one of the blocks around or done something to it that messed up the dependencies. It doesn’t take much to upset CL processes.
Hope this helps - comparing the code is what revealed it to me. I could see a js error in my console too but it wasn’t telling me anything and my hosts looked for errors showing that side and that didn’t say anything either. You’ve got 3 big plug-ins interacting there on top of wordpress so it’s hard to isolate but I think that is the only way.
Hope that helps you find it. I might be wrong but I think that’s a reasonable way to chase it down.