Some Tradestation indicators have more than one part to install on the chart.
We'll use the GRaB candles as an example. 

When you install a tradestation indicator, the install wizard tells you what parts of the study there are.
​
As an example, the installer for the GRaB indicator installs more than one part of the study.
​

​

It will also show the names of each part of the study. 

​

After installation:
​

Studies > Add Study...

On the left side choose the appropriate study type.
In this case GRaB has an indicator part...

...and a paintbar part. 

If all parts are added to the chart, the indicator will look correct. 

 
​ 
​ 
​ 
​ 

 
General Installation Guide for Tradestation:
​https://intercom.help/simpler-trading/en/articles/3288127

How to download Raghee Horner's GRaB Candles, Moving Averages, Propulsion, and Darvas:
​https://intercom.help/simpler-trading/en/articles/3263730

How to Un-install an indicator from TradeStation:
​https://intercom.help/simpler-trading/en/articles/3188639

I can't find my Indicator in Tradestation after installation
​https://intercom.help/simpler-trading/en/articles/3476867

Tradestation - DLL file error
​https://intercom.help/simpler-trading/en/articles/3476968