Reactive bar chart - Legend order flipping

[DSDD]

Dear Community,

i created a reactive bar chart. The problem is that the legend order respectively the color of the groups flip arbitrarily dependig on the users selection via a slider.

Example slider value 30

Slider value 70, other selection

Other Selection, other slider value:

On what does this depend? Does it depend on the first data row of the result?

How can i define the desired order and desired color??

Caveat: The Grouping dimension depends on a reactive variable.

Thanks in advance

[dplr-rn]

hard to diagnose without more details but most likely due to your sort order 

[DSDD]

Sort order of what? Is there any possibility to define an order within a reactive calculation?

 The code for the group-dimension in my bar chart is written in R included in R.ScriptEval()

Lets say the two levels of my grouping variable are "bottom" and "top". But my output-column depending on the reactive input value not necessarily contains both.

Is there a chance to define the order, maybe within a variable?