As far as I can tell, this is far from common. I can't find anything matching in the knowledge base or in the defect tracking database, which would indicate that no-one else has encountered it in any of the (extensive) sequence of QA testing, joint development work, managed releases and beta cycles throughout ePO 4's lifecycle. While it may seem like "such a simple thing" to you, if we don't know about it, we can't fix it...
The ePO interface is web-based, and as such can be sensitive to browser versions, settings, and so on. The component of ePO that's responsible for the interface has been extensively improved - have you tried ePO 4.5, or the 4.6 beta, to see if they exhibit the same problem in your environment?
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