Thank you for contacting us and I'd be happy to assist.
I've performed some tests on my website and was able to reproduce the warning notices on the checkout and the order thank you pages. These notices are shown when the product is added to the cart, without the Toolset Form and the 'Toolset Forms Commerce' plugin is also active.
Thank you for bringing this forward and I've shared these findings with the concerned team for further review. Because the fix for these notices is fairly simple, most likely it will be included in the next release of the 'Toolset Forms Commerce' plugin and we may also have a patch to share with you, before the release.