It's the same with me. The issue is just in amethyst. Every thing else is great here on Amethyst.
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It's definitely graphene's keyboard. There is a longer discussion here: 
GitHub
pressing backspace when creating notes does remove the last whitespace between words too · Issue #154 · vitorpamplona/amethyst
Briefing pressing backspace when creating notes does remove the last white space between words left to the cursor too. Exact behavior differs from ...
Thank you Vitor!