Hi,
Kindly check the attached screenshot.
I have shared the scenario and detailed screen shot.
You can try on any of project at your end.
Basically that PPOM not allowing the decimals calcuation to be added in cart.
So try to set width in decimal and change prices in variation as per width.
Then try to add in cart.
You will be able to see the issue.
Let me know if any kind of further details required.
Thanks.