Hi @Hugo_Pires, sorry for the late reply, have you solved your issue?
If not could you please report the Kibana version you are using and if possible a screenshot?
Thanks for the screenshot, I've tested it locally, and seems that this behaviour is caused because you didn't assigned a Color measure to the line chart element:
this is because, using timelion in the way you are doing, just merge both dataset without distinguish the two series.
You have to add a label for each series like:
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