Basically there's a problem where advancements added through things like Datapacks, Server code such as Spigot/Plugins or whatever other ways if it's not the vanilla ones and the size requires the window to be moved around it will glitch and move up and down repeatedly and not show the actual rest of the area to reveal the out of frame advancements but again it still works in the vanilla menu.
Here is an example of me trying to navigate a custom advancements menu and it glitching out: https://giphy.com/gifs/j0paIn1wbt9vOncSPv
Updated to add datapack showing same problem, this is in a vanilla environment.
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For this example I'm not using a datapack, this is using the SpigotAPI to add advancements in upon server start for the use of dynamic advancements
Thank you for your report!
However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.
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I have a datapack which I added similar to the ones I was using for bukkit and still the same glitching problem: https://www.dropbox.com/s/e7za62wk0zf5rip/hub.zip?dl=0
Please attach the data pack that is causing this issue, or a test data pack that the issue can be reproduced with.