Hmm, haven't encountered this bug before. Thanks for the video, that should help a lot.
Edit: Could you link the guide with this issue (if it's still happening)? I poked around some of your guides but couldn't find the exact same item sets. Maybe you changed them since you recorded it?
Edit: Could you link the guide with this issue (if it's still happening)? I poked around some of your guides but couldn't find the exact same item sets. Maybe you changed them since you recorded it?

Thanks to Jovy for the sig!
Yea, I was busy updating them still so I haven't really published it yet. But I tried it again with the same item set today, it didn't give me any issues today. But day before yesterday it was happening everytime I tried to edit it, so I thought I should report it. Perhaps something did not load properly on my browser that day.
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I tried to record the bug (if it, in fact, is a bug) but it's not a big deal just for curiosity.
(link: https://drive.google.com/open?id=1sgnmmKYtlDyaXFwtM_X_fU3kYiIRXuy0)