>>> Please tell me what I did wrong, if that´s the case, and how to correct it. <<<
'Doesn't sound to me like you did anything wrong, or that anything needs corrected :)
When we we work/tincture with dried herbs, the resulting 'mix' is typically consistent (after it sits overnight a tincture separates into 'herb mush at the bottom' and 'floating alcohol on the top'. But when working with fresh herbs (especially things like peppers that have a higher content of 'juice'), it sometimes takes a long time for the 'jar of mush' to separate out into 'herbs at the bottom, float at the top'.
The 'alcohol stream' you mention in the middle of the jar is something we've seen before when we make our Cayenne #1 tincture (that's the one with 90/95% fresh habaneros). The "pepper mush" will eventually settle to the bottom, or it won't....and it really doesn't matter to the quality of your tincture if it does or doesn't.
It sounds like you made your tincture perfectly, just shake it well everyday (Dr. Christopher would say, "shake it every time you walk past it :), and it'll either split into "mush with floating alcohol atop" or it will have the veins/streamers of alcohol throughout. What matters is the end result - and no matter how the alcohol opts to 'stream or float' won't make any difference to your final tincture.
'Sounds to me like you did a great job and you're going to have a VERY powerful & healing end result