Form code cut when pasting into Joomla

Form code cut when pasting into Joomla

I have created a web to lead form in Zoho and copied the form code using the Joomla tab. I then paste the code into the Joomla page, using the html view and update. However Joomla removes about half of the code and displays the form incorrectly and the buttons are inactive.

I paste the same code into a plain html file and open in browser it works fine and creates leads in Zoho. Have tried to paste it in twice into the same page and the code is cut of at the same point for both code set.

Not sure whether the problem is in Joomla or in the code. Betting on the code because I tried a form code from Paypal into Joomla and it works fine.

I anyone familiar with this problem?