When using the roll command, anything with two digits causes the command to duplicate.
IE. 2d9 does not dupe, but 2d10 will.
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My first (now deleted) post said I failed to replicate. But that was before I realized the title said on Android.
Trying it there, I could replicate the bug, where things got duplicated in the console. Also, it continued to duplicate when trying to erase the text.
Thanks for reporting this! And welcome to the forum! 
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I have tried to see what might cause it.
It seems to be some sort of unholy interaction between CodeMirror and Samsung Keyboard on Android.
When trying with GBoard, the problem disappeared.
I also noticed that I could avoid triggering the bug by not styling the d in 2d10 in the console.
I will use that as a temporary fix.
Also, I created a GitHub Issue for it:
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