Please work properly with Grammarly

I use Grammarly on everything, and it works amazing on almost everything I do. For some reason, it does not work on Optimizely/Welcome. Instead of a simple change in spelling or grammar error, it duplicates the content in any comment box. It actually does not even work with this text box. I am not sure what the issue is but knowing I have no issues with it on other sites and platforms it must be something on Optimizely's end.