Link to element of TOC doesn't work correctly

Link to element of TOC doesn't work correctly

I have a text document with a table of content (TOC). When I create inside the document a link specific chapter, I use "Insert Link" and select form the "headlines" dropdown box the specific headline of the chapter. A link is created - BUT: this link does either nothing or jumps to a different chapter. Looks like a bug. I tried to refresh TOC, generate link again, it doesn't help.
What am I doing wrong? 

Update, I just found what's going wrong:
  • When the target is below the link in the document, it looks good, the target headline is on the top of the page.
  • When the target is above the link in the document, the display scrolls up just so far, that the headline is on the lowest position on the page. This is not what the user expects and is puzzling.
It would be great if Zoho could enhance this.

Update 2:
It's seems it depends on the browser. The described behaviour is on my PC with Chrome and IE. On iphone Safari it looks good.