Ok, found out that the transparent effect was causing the issue, i had my colors defined as c1=‘FF000044’ but ‘FF0000’ works fine.
For those who are in the same case :
http://reeddesign.co.uk/test/namedcolors.html
http://garyfeng.github.io/2016/06/plot-ly-transparent-image-background-my-hacks.html
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