Unable to add more than 3 steps in Test Suite

I have multiple API methods in one single scenario. While creating one step for each API method, after 3-4 steps no more steps are getting added. However, while addeing steps it is not showing any error too. Please find the approach followed for the creation.

1. Create Project
2. Add resource
3. Create Test Suite.
4. Add Test scenario.
5. Add step-1, step-2,step-3 etc...

In the above case i am able to add upto step-3 after that no steps are getting added