Symbols change colors

[demdeberanz]

Hi everybody, I get a strange problem. I print on a map some symbols (simple marker symbols) each with different color related to the values of a specific attribute.
All function properly but when I zoom in the map all the symbols become of the same color (losing the previous one).

Someone can help me?

Thank you everybody.

[StephenLead]

Can you upload your code?

[demdeberanz]

Can you upload your code?

Sorry, I fixed the problem!It was my fault, I had got a cycle but I was using the same symbol object for every feature while I should instantiate a new object for each ones.

Thank you!