What browser do you use? How did you install Zabbix frontend?

Tried it in Chromium 55.0.2881 and Firefox 49.0.1
from http://repo.zabbix.com/zabbix/3.2/debian jessie
aptitude install zabbix-frontend-php

Kodai, could you please verify? The svn version works perfectly well for me.

what's your screen/browser window size ? can you post a screenshot, showing the whole browser window ?

I am seeing the same symptom, only it affects my Blue theme. Dark theme is fine for me. Symptom presented itself following apt-get upgrade to 3.0.5-1+jessie installed from http://repo.zabbix.com/zabbix/3.0/debian

Blue theme was my default theme. Symptom is present when selecting Blue theme or default theme. Buttons return to normal positions when selecting Dark theme on my installation.

Screen size doesn't affect it. Happens with any sizes.

I think this is not package related issue.

Please try clear browser cache or force reload if this problem happened after upgrade. I met this kind of problem caused by CSS cache.

Kodai's theory is supported by experience today. I did not explicitly clear any browser cache, however the buttons on the affected theme (Blue in my case) are once again positioned in the expected location.

I just tried it in Vivaldi browser which I didn't use for Zabbix before and the buttons were on their places, after it I tried it in Firefox without cleaning and there was no problem either. But after a short time the problem appeared again in all browsers.

are you using an external http proxy, maybe ? a transparent one ?

in any case, it does sound like the problem is not with zabbix in this case.

yes, cloudflare is the problem. forgot about it, sorry.