rlt language problem in writing curved text

Hi, It is a great plugin that I have used for making these badges:
http://techclans.com/members/admin/achievements/

But after updating it; when I want to write a curved text; the characters of a word are written separated from left to right, so I can not use it anymore.
I thought adding some styles to text-canvas may solve the problem but it didn’t work. Any suggestions?(normal badge text works fine!)

<canvas id=”text-canvas” width=”200″ height=”200″ style=”
direction: rtl;
text-align: right;
unicode-bidi: embed;
“></canvas>

https://wordpress.org/plugins/openbadgesme-open-badges-designer/