Hi @gayathri ,
I have made a test on my side and I can only see the top apart. Everything is normal when I click on the link.
I guess whether the client used by the client is not the same as the one you are using, so there are different results.
Please try to check the online doc and get more details about formatting approval requests:
In addition, if you are using the Flow template to create a Flow, you can try to create a new Flow from the blank to do a similar test, and use the syntax mentioned in the Doc to add a link.