When you open the keyboard in the reply window the thread will auto scroll until it reaches the top
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Not sure if related but this sometimes happens too
I anticipated the same problem.
Users believe that when the topic is more than 100 posts, it becomes very easy to occur.
same bug in my forum (https://forum.cwowd.com/). It happens in every topic but in shortest it’s almost not noticeable (a flash and it’s OK). On longest topics, it’s totally unusable. Tried to removed every component and added CSS, no effect
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The staff have fixed this issue. Please rebuild.
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Temporary mitigated at the following PR, just sync with the latest commit.
I think the fix is currently in a file of the chat plugin (plugins/chat/assets/stylesheets/common/base-common.scss). I wonder if forums where the chat plugin is disabled still need the fix for the full-screen composer.
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I’m currently on latest
If you are on latest (the version commit can be seen using the F12 browser console) and still has the problem, clearing the browser cache and reload may work.
Please recheck and see if the issue persists. 
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Yes it should have been fixed.
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performed a rebuild, looks like this bug is indeed solved
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