Pareto Chart not scaling inside a master mashup

i have a mashup (everything is set to responsive insede it) that has a pareto chart inside it and when i click "view mashup" everything looks fine. When i place this mashup inside a master (also everything is responsive in there) only the pareto chart doesn't scale in it. I tried with other widgets, like line chart and bar chart and they are working fine. I'm uploading some screenshots.