There are limitations on the first message after a comment. You can see more details here:
https://support.manychat.com/support/solutions/articles/36000293707-instagram-comments-growth-tool
Basically you need to have a simpler message. What I suggest is giving the person a simple CTA with a button to click, and then you can go on with the rest of your flow, collect information, etc.
This is an IG limitation, not Manychat. It’s how the comments trigger works unfortunately.
Anyways, in short, the objective for your first message after the comment should to get the person to click and follow through the rest of your funnel. Keep it simple, and you should have no more issues with the automation ;)