Topics with a gap at the top of the page

[#1]

This is something that has been happening seemingly randomly for a long time. Some topics have a gap at the top of the page while others start at the top as expected. Here's a side by side comparison:

The headings for both of these topics use the same style and they use the same css file. I don't see anything in the html that would explain this, as far as I can tell. Anyone have any idea why some topics have a gap at the top?

[#2]

This is something that has been happening seemingly randomly for a long time. Some topics have a gap at the top of the page while others start at the top as expected. Here's a side by side comparison:

The headings for both of these topics use the same style and they use the same css file. I don't see anything in the html that would explain this, as far as I can tell. Anyone have any idea why some topics have a gap at the top?

[#3]

This only in the HTML5 output or do you see it happening in the RH project topics? Does it happen if you generate other types of output?

[#4]

Which version of RoboHelp and is it up to date? There was a similar issue in 2019 fixed in an update.

[#5]

This is Robohelp Classic 2019, up to date. When I do a preview in Robohelp for a topic with a gap, there is no gap. I've only tried this in HTML5 output. It's the only output we use.

[#6]

Any master page involved. In the output have you tried specifying the CSS in the layout?

If that doesn't help, try taking a fresh copy of the skin you are using. You will need to give it a different name, perhaps just add "2" at the end.

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www.grainge.org

[#7]

By comparing generated HTML5 topics with and without the gap, I found that all of the topics with the gap have the following html near the top (possible serial number edited out):

<object id="hhctrl" classid="clsid:[Possible Serial Number?]" 
 width="0" height="0" vspace="0" hspace="0" border="0" type="application/x-oleobject"></object>

I'm not sure what's putting that into the generated files. It seems random. When I remove it from the generated topic html file, the gap disappears.